That you take a look at the Cobra Seawolf Class Association Website. Go to www.cobra-seawolf.org.uk/
Currently there are three or four people asking the very same question that you are asking, and most answers to questions you may have will probably be there.
BTW We have a Bilge Keel 850, and she is a smashing family boat with a good sailing performance!
Friend of mine has the long keel version. We have had five people aboard for a week with no fights, thanks to the roominess given by the fact that she has relatively high freeboard and is nicely beamy, sailed in everything up to a force 6 in comfort, and when motoring she'll almost go astern in the direction that you want her to go! The fittings are generally of a high standard. The engine can be a bit of a pig to get out if needs be (he changed his for a Lombardini), but is relatively easy to access for routine servicing, and you get a usable galley and a proper chart table with plenty of room on the bulkhead for instruments. The v berth is adequate, the double dinette berth is luxurious in respect of some other boats I've been on... In my opinion if you must have a platic boat (I'm a real wooden boat fan) then you could do an awful lot worse.