Thanks for all the replies guys, realy interesting, keep 'em comming.
For me, its a mates H9 60 size Mustang, but I've only just got into warbirds and not flown many.
A friend at my club has just got his H9 Hellcat into the air and he says it flies realy well.
Once he's got a few scratches on it I'll try it out.
Seems like Mustangs are a firm favorite though.