if you want dsp along with it the creamware pulsar 2 or the smaller (half the dsp power,3) is a great solution for good a-d convertors and dsp prosessors.
wide selection of mixing tools,reverbs,guitar fx,analog compressor emulations,synths and powerful modular.
oh wait... what exacly is your budget?
if your on a realy realy tight budget you should try the new emu cards. they are very cheap,around 180 $ i think for the 1212 model.
http://www.creamware.de/
http://www.emu.com/