Assuming you intend to fly for fun, not as the start of a career, then the micro route is sensible. Good two seat three axis control micros can be had for as little as £3k (eg Thruster TST). Look on AFORS site to get an idea. Also they are cheap to maintain and run.
See the club and schools directory on the BMAA website (click on Learn to Fly Microlights - this gives drop down menu with the schools directory). Find one near you and go and talk to them to get an idea of what its all about. Better still visit two or three.
If you are anywhere near the Cambridge, Peterborough or Northampton area send me a pm and I'll tell you who to go to see.