First, why would you spend the extra money for an f/2.8 lens and it's extra light gathering capabilities... then turn around and install an ND filter on it that reduces those capabilities? That makes no sense. ND filters are specialized... used for very specific purposes.
Second, contrary to wildly popular opinion, UV filters were never really intended "for protection". In fact, UV filters are a carryover from the days of film, much of which was overly sensitive to UV light and the filters were used to reduce bluish casts in images. Digital doesn't have the same problem with UV light. And, thin glass filters are actually far more fragile than the lens itself. By far the BEST "protection" for a lens are the matched hood and lens cap that came with it. (Those are highly recommended to also protect any filter that's being used.)
Watch this video and decide for yourself, how much faith you can put into a filter for "protection"....
https://www.youtube.com/watch?v=P0CLPTd6Bds That said, when I do use them, I
mostly use B+W filters. They're a good value... very high quality at reasonable prices. Your lens probably has 77mm filter threads. In that size:
$38 for B+W "F-Pro" MRC 010M (8-layer "multi-resistant" coating)
$41 for B+W "XS-Pro" MRC Nano 010M (16-layer "Nano, multi-resistant" coatings and a slimmer mounting ring)
Both those B+W filters use high quality, German-made, Schott glass, mounted in brass frames that are less likely to gall and get stuck on lenses. The additional coatings of the XS-Pro make it easier to clean, as well as more resistant to finger prints and dust. I'd note that even the standard frames they use are pretty slim, and that the even slimmer XD-Pro that might be needed for an ultrawide lens, can be a little more difficult to install and remove. But even the slimmer ones have front threads that allow standard lens caps to be used. B+W is a subsidiary of Schneider-Kreuznach, who've been making top quality lenses for 100+ years.
Sure, there are some cheaper filters... mostly unspecified glass and mystery multi-coatings in aluminum frames. The majority of quality, multi-coated are a little to a lot more expensive than B+W in 77mm size:
$19... Breakthrough X1 UV MC ("4-layer" multi coating)
$22.50... Hoya Multi-Coated MC (sale price... unspecified glass, coatings or frame material)
$23 to $26... Formatt HiTech Firecrest UV (close-out pricing, normally $42-$52)
$36... Hoya Alpha UV (unspecified glass and unknown coatings)
$49... Breakthrough X2 UV MRC (8-layer multi-coatings)
$50.... Cokin PURE Harmonie UV MC (16-layer multi-coating)
$50... Marumi EXUS Protect (not a UV filter, unknown glass, unspecified multi-coatings)
$54... Hoya NXT (3-layer MC, "optical glass")
$63... Formatt HiTech UV Schott-Desag (Schott glass, unspecified multi-coatings)
$64... Tiffen Digital HT UV
$70... Sony Multi-Coated UV
$72... Vu Ariel UV
$81... Hoya EVO Antistatic UV
$82... Rodenstock UV MC
$99... Breakthrough X4 UV MRC (16-layer multi-coatings)
$102... Vu Sion UV
$115... Hoya HD3 UV
$124... Zeiss T* UV
$126... Rodenstock HR Digital UV
$155... Heliopan SH-PMC UV
I got the pricing above from the B&H Photo website. They stock nearly 40 different "multi-coated" 77mm UV filters. I didn't include some brands I've never heard of.
Whatever you spend on a "protection" filter... Just be aware that it's largely money spend on nothing useful. Personally, for most of my lenses I have UV filters (mostly B+W MRC or better) that spend much of their time stored separate from my lenses, which I'll install if out shooting in a sand storm, at the beach and in certain other circumstances when they might actually serve a protective purpose. And I choose UV instead of plain/clear protection filters because even with digital there are rare occasions when the UV filtration might be helpful to reduce bluish atmospheric haze, too. In other words, UV may have a little more purpose than a plain/clear filter. But even so I probably use them less than 1% of the time. A high quality Circular Polarizer is a far more useful and frequently used type of filter. But I don't use those very much on telephotos, either... much more on wide angle and normal focal length lenses.
You'll have to weigh possible loss of image quality against the benefits of any filter. High quality, multi-coated filters generally have little negative impact on images... under normal lighting conditions. However when conditions aren't normal, even the best filter can cause increased flare and other issues in images. For example, one time you should be sure to remove all filters is when directly photographing a sunset or sunrise.