http://www.soundonsound.com/sos/mar98/articles/akaidps12.htmlI would avoid the DPS12, I've done a quick search and it uses Jaz drives for storage, which can be pretty unreliable. Also it doesn't seem to offer you any benefits over any other digital EQ.
First and foremost I'd get the basics right. I presume you have a decent set of monitors or headphones to work with, so beyond that, if sampling from vinyl is your thing invest in a good quality turntable. Perhaps look into one that plays at all three speeds (33 1/3, 45, 78 rpm) so you're not left short on options if you do decide to sample some 78s.
At this stage I'd also invest in a good set of needles, the sound quality is hugely affected as you can imagine. I've always been a fan of Ortofon, but it's personal preference, although I think they do one called the "Arkiv" which is meant specifically for recording vinyl. I'm not sure what advantages it has or if it's just a marketing gimmic, but check it out perhaps.
Lastly, I suppose a mixer of sorts would be beneficial for some initial EQing, to remove any naughty bits before you go into your MPC/DAW.
The final thing to remember really is this: "Buy cheap, buy twice". It's better to save up longer if you're not sure what you want and invest in a product that will last.