It all depends upon what you want and what you plan to use the car for. If you want a 'recent', fairly high spec car then there is a lot to be said for a LE500 and they are within your budget provided there are no major issues to be fixed. The 85th anniversary model would be a great buy in good condition.You would be limited to a 135 - but then I drive a 1.8i F and am quite happy with the way it goes now.
Personally though, I'd go for a late TF - 2004/5, for well less than half your budget, then spend the rest on doing modifications. For me, working on the car is part of the pleasure (although you might wonder some times given the language coming from the garage).
Richard
1.8i Mk2 Solar Red, 16 inch square spoke wheels, MGFMania hood with zip-in glass rear window, DRLs, Kmaps ECU, Pipercross panel air filter, MGOC Supersports back box & some cockpit bling