Ekisbey,
I used a Franklin 6 in my canarad. I got it in parts and rebuilt the thing.
The whole thing w/o accessories was below $10K. You can add automotive alternator, etc. to keep price down, etc. It seems to give quite decent power, but since it uses a bed mount might be on the heavier side (300+ lbs). More info on my website: http://www.abri.com/sq2000
Franklins are available from several sources in US. The most advertised one is www.franklinengines.com. Also Bruce Kown in GA sell a lot of them (770-386-7435) and Susan Prell in TX (A1 dealership) 903-626-5115. There may be others.