You can see a list of all the PFA approved types on their webpage:
http://www.pfa.org.uk/pdfs/Hombuilt%...0by%20Type.pdf
and they have datasheets on a number of them here:
http://www.pfa.org.uk/engineering_aircraft_index.asp
I suspect you may find it tough to scratch-build or kit-build any suitable PFA design for less than the price of an already-flying Taylorcraft (or similar).
Sometimes partially completed projects can be purchased for a good price, that might give you a head start.
Wittman Tailwind jumps out from the list to me as a timeless classic that can be scratch built and meets all your characteristics - and the performance is outstanding