Rust rust and rust,everything else is irrelevant,tinworm is the killer of these cars on the body and subframes,as for price anything goes,my advice is buy the best you can afford.Avoid the 850 as its underpowered,the 1000 can go well and revs nicely and the 1275 is a torquey little beast with a bit of help letting them breathe more easily.
a couple of shots of mine,work in progress,all the black bits are carbon fibre...