Hey guys --
Sorry -- I deleted my last post because after rereading Uribe's original message, I realized that I had gone WAY off-topic.
What you are asking is as follows:
What kind of DESKTOP should you get?
You want an XP system; which machine would be best-suited, and what other peripherals do you need?
To answer this question, I'll refer you to MicroCenter or NewEgg. Both outlets have tons of machines that are hovering around the $500-$1000 mark. You should get one that has a PCI slot, so that you can add a nice audio/MIDI interface card. (I would do this rather than go with a FireWire or USB. You'll get better performance from the PCI bus than you will with any other sort of configuration, save for USB 3.0, which isn't going to be out for another year at least.)
You can look at the Dells and the HPs. I'd stay away from eMachines and Gateways (because Gateway was bought by Acer, and Acer SUUUUUuuuuuuuuucks....)
Finally, once you get your machine, get an M-Audio card. You can get the Audiophile Delta 192 or the Delta 2496. They are both great, and the 2496 has the benefit of being under $!00.
(EDIT -- I have stated somewhere else that only 64-bit versions of Windows 7 will be available. I have no idea whether this is true, so I'm not even going to speculate on it anymore.)
Sammy
Yes we did.