That's good advice from Sanctifier!
Also look for traditional auctions in your area. I finally picked up a 48x48 Scat Blast for $700, and a pressure-blaster for $75. I went high on the cabinet, but it was the 4th auction where I tried to win one. Still got a good deal on it, and a killer deal on the Eastwood pressure blaster!
I do need to upgrade the dust collector. It's basicly a shop-vac motor with a bag filter. It's ok with a siphon feed, but not adequate for pressure-blasting.
My workplace has an awesome pressure-blast cabinet. You would'nt believe how fast it works! An intake in 10 min. Yes, I've gotten spoiled! But then again, it's a $4000 system.
Some of the hi-end cabinets have a media separator that will separate the dust from the re-usable blast media. That's a worthwhile option if you use it ALOT.
My basic recommendation is to get a nice cabinet, and then upgrade to a pressure-blaster and a better dust collector.