When I first got into spads I built an SNS (That's Saturday Night Special) in about three days...then several weeks later I built two planes in one day. A CoroStang and a Dave West Mig7 - The plans were well put together, free, I had free support for any questions I had (I don't recall having any for the CoroStang-and the Mig 7 was alot more difficult in terms of building. Geesh, the coro stang is almost a cut and paste airplane if you ask me. Just like building anything..a little pre-planning goes a long way.
Any way there are LOTS of spads build for combat..here's two of them from one of our top Hawaiian Guys-
http://spadworld.net/combat/shreddy.html
If you go to the rccombat associations home page, you'll see a plethora of information on whats hot and whats not. Don't be afraid to ask any questions you may need to.