I'd recommend the Sony PCM-7040, PCM-R500, or PCM-R700
All are 4 motor decks. The 7040 has killer error correction that has recovered otherwise bad tapes for me, but it does not support LP or 32Khz playback. The R500/R700 are pretty good (not as good at the error correction as the 7040) but support 32Khz playback.
7040 also is AES/EBU only.
on ebay:
R500's go for $100-200 (in used not mint condition)
R700's go for $150-300 (in used not mint condition)
7040's go for $100-300 (in used not mint condition)
Other good sony's:
PCM 2600, 2800
DTC A8, A9
PCM 7010 - This is a similar deck to the 7040 but a couple of versions back - supports 32Khz but more complex transport - with correct Digital IO modules installed these go for $400-500 on ebay