build it. all the way.
the only foreseeable benefit to buying one as a newbie to printing would be your exposure time. a pro setup will cost you a whole lot of dollars and get the job done in a minute or 2. this setup is waaay cheaper (we spent about $100 total) and takes just about 8 minutes to burn our screens.

2(two) 500-watt shop lights (15 bucks at Home Depot) are suspended about 2 feet under a piece of glass (ours was a 2×3 foot glass table top that Tim had lying around). 2×4’s make up the structure. the lights plug into a power strip and boom, you have a switch. A stopwatch or kitchen timer proves to be an excellent device with which to keep time. you could get fancy and plug the lights into one of those photographic timers if you wanted to.

easy!