Fostex R-8
It's a nice machine, especially for the right price.
I'm also mainly a Tascam person, but I've invested in a fair number of Fostexes, too. I got an R-8 in excellent condition a few years ago, for $250, and I thought I made a tremendous deal.
The small size of the R-8 is an attractive feature, sometimes, as well as Fostex's forward looking use of plug-compatible sync devices, and making all their 80's-and-newer devices sync-plug-compatible. The Fostex's 15ips on 1/4" tape is a nice feature, too, which is something that Tascam never caught on to, but I've never been as happy with Fostex's Dolby C NR system as I've been with Tascam's dbx NR system. YMMV.
The Fostex R-8 is small & portable, with an integrated handle on top, which is a very unique feature.
All in all, it's not a bad little unit. The near-mint unit would be best to have, and the heavily worn unit would be less desirable.