if you can convert yourself then a 10vT will be cheaper by a long long way...
300bhp from a 10vT is very very easy... Engines aren't overly priced like 20v's and its essentially your engine with a turbo and extra components so fitment is straight in.
With 10v's you want to convert to EFi over the Kjet to obtain good BHP, this can be done a number of ways to keep costs down.
10vT has a much better noise to it and low down grunt with a bit of lag for turbo power. But as said anything over 450bhp and i'd go 20vT
