A computer for under $1000 is certainly very easily doable. That Sweetwater machine is priced pretty high though, I hope their support is well worth it, or it ships with a bar of gold. I just built an i5-750 machine using parts I had lying around and spent $100. I would say that if you were careful about the parts you ordered, you could build a very capable machine for under $800. A current i5, mATX motherboard, decent case, hard drive, RAM and graphics card should all be under $600 if you choose carefully. Get into a more advanced build, and you'll see $800. An i3 machine for so much needs to come with some really good tech support to make it worthwhile. At my shop, some i3 builds will get into the thousand price ranges, but my shop provides extremely good service with all machines, along with a very generous warranty on parts/labor for all machines. Any current machine should be easily capable of running several tracks with minimal effects on each track before running into any latency issues whatsoever. Even a Core 2 Quad machine should be plenty capable with 6-8gb of RAM. Core 2 Duo and older machines will see more issues with higher track counts, and plugin use.