Out of nostalgia, last summer I was looking into building an F kit. As I recall from a summer of watching eBay, the least expensive pre-AI, pre-multi-coating lenses at that time were the 28/3.5, 35/2.8 and 50/2 at about $50 each. The 24/2.8 would show up once in a while for about $100. The 35/2 and 85/1.8 seemed to go for more like $150. The 180/2.8 is AMAZING and worth checking out, but I wasn't pricing those at the time. (All this just from memory. Also, I was looking for good glass but just user cosmetics.)
Personally, I'd go 35/2 + 85/1.8 up front and keep an eye open for the 24/2.8 and 180/2.8, down the road.
A 28/50/105 kit is another good way to go. Some people just can't live without a 50, and the 105 is superb. But if you have a fast 35 and a fast 85, you don't need a fast 50 and can slot a 55/3.5 Micro Nikkor in there. The 55, of course, is another legendary Nikkor.
Footnote on the 85s: The 85/1.8 is a big hunk of glass, and heavy. There were two later 85/2 models that were much lighter. The first one had slower focusing (requiring more turning of the lens barrel) and the second one had rather quick focusing (much less turning). I've used them all extensively. Leaving price out of it, I'd say the one to own is the second 85/2. It's the smallest and lightest and quickest to focus. But the 1.8 is a complete classic and I'd pick it over the first 85/2.
