Under $200, that's really tough. I have a few pieces that fit that description though.
DBX 160X compressors go for around $200 on eBay. I have a couple of those that I love and also picked up some DBX 903 compressor modules for well under $200 each, and some Aphex Expressor modules for under $100 each. My DBX 900 rack was under $200, new in the box. Just bought a couple DBX 905 eq modules for well under $200 too! I think these modules and the older DBX professional gear in general sounds great and is a steal at current used prices.
A while back Guitar Center was blowing out Groove Tubes DITTO DI boxes for $199, and those sound WAAAY better than $199.
The best low budget 24/96 converter in my opinion is the ART DI/O, which sell for around $139 or so. Maybe less if you get a good deal. I have three of them, and they sound better than they should for the price, especially once you get a better powersupply for them.
As Massive mentioned, MF is blowing out ART PRO VLA's for $239. A great deal. Not sure how close I'd want to get to his PRO VLA though, sounds messy.