Nikon FE2
Minolta MD 100-500 f8, from a dood in a gas station parking lot via craigslist. Getting it professionally cleaned ($70) cost more than the lens. (came with a free fully functional Minolta X300 which is a surprisingly nice little SLR)
Worst case scenario, I have something to take with me to the batting cages...
New Helios 40-2 in Nikon mount. I was hummming and hawwing over the Petzal, then saw this and much preferred the results with it. Nikon mount means I can use it on my Nikons (!) as well as my Leica M with my Fotodiox Pro adapter. That adapter is surprisingly nice. Rock solid on the camera, really nicely feel/fit/finish.