If you do go for RN choppers either go for the Merlin (new one to replace the Sea King, look nice IMHO) or the Lynx (I know one of the pilots on 815Sqn and the others seem like a nice bunch of guys.)
Get posted to RNAS Yeovilton and join the RN Aero Club to get a share in a Yak52 (I've flown in it and it's a very nice place, albeit a bit right-wing heavy.)