I found myself in your shoes a while back. I saw a plasmacam advertised in a magazine and thought it was the coolest thing I'd seen in a long time.
Till I saw the pricetag that is.... I couldnt justify spending that much money on "another hobby". Then I found this site and figured I'd try building one myself. I knew nothing...repeat NOTHING about cnc. I built the basic table for about 5 dollars worth of scrap steel. Geckos, motors and power supply set me back about $1000.00 (ouch).
I still dont have a plasma torch yet...need more money...(wanna buy a tractor? but my table is built and moving under the control of mach2 and sheetcam demo versions. I already had corel draw. It's amazing to design something in corel, run it through sheetcam and watch mach2 move my table.
My wife just rolls her eyes at me.
I'll but licenses for sheetcam and mach2 when I actually start cutting.
Oh, and Campbells THC too.
Anyway, I'm glad I'm building my own... then again, I'm not pressed for time.
Its taken me a few months. If you want to get to cutting right away, maybe a purchased machine is the way to go. Your choice.
There is lots of support on this forum.
I'd say go for it.
Good luck, John