DIY Lighting

I am planning on setting up my 125g soon to accomodate my extra
plants from my 75g, but am unsure of which lighting to go with.
I could build my own flourescent and use 8 40w bulbs, but the cost
of outfitting my tank with eight $20 bulbs and fixture does 
not appeal to me.  I was wondering if anyone knew of an inexpensive
metal halide setup that will work or else an inexpensive VHO ballast
that will power 72" bulbs.  Thanks in advance,

schovill at expert_cc.purdue.edu