I purchased a Sandmar (now Olec) FX1200 plate burner. It is a self-contained metal-halide lamp, vacuum frame and light integrator. It works great! Bulbs aren't cheap and they have a definite lifetime ($40 for a MHL-1000 or GW-114..) but it's a pleasure to use.

I'd go for it, especially if you plan on building a BLB fixture. I purchased my unit for $100 but had to drive two hours to pick it up.

Also check for Douthitt frames, very high quality. Olec makes some nice ones as well but I believe they are better known for their Olite lamps and light integrators.. *shrug*