Worth mentioning that for an hours builder, or just somebody who wants unrestricted cheap flying, you could do far worse than buy a cheap PFA single seater - say something like an MW7 for around £3k. Fly the pants off it, do your own maintenance, and I doubt you'll find you're paying more than about £25/hr, plus perhaps a total loss of about £500 if you sell it with loads more hours on it.
For example, I've just cut and pasted the following from the PFA's website (to save upsetting the powers that be there, since it's in a members only area, I've not included the contact details, but if you're not a member, you should be, then you can get them for yourself)...
MW7, 532 Rotax, 360h TTAF/E, 60-75kn cruise, 900fpm climb, 100kn vne. Good condition, riggs solo in 1/2hr, can email photos. Cheap flying for £3,495.
RAND KR2, new Permit 1834cc, VW fuel injected ACRO engine, fixed taildragger undercarriage, cheap to operate, £7,000 ono.
RANS S-10, 2 seat taildragger, Rotax 582 65hp, TTAE 50 hours, radio, always hangared, Permit expired, Cambridge based, potential for aerobatics. £5,000 for quick sale
CORBEN BABY ACE, single seat, open cockpit, airframe 790hrs, A65 60hrs since overhaul 2001. Permit June 2003. £6,500 or P/X for two seater
DRUINE TUBULENT, 150hrs mainframe, 35hrs on new engine/Leburg electronic ignition. Many extras - pristine. If you want a turbulent you will buy this one. £6,750ono
G