You should be able to afford a low mileage 993 (911) or a higher mileage 996 (1999-2001) or any Boxster or Boxster-S. If you go Boxster, you want 2000+, when they offered the 2.7L engine in the base model and 3.2L in the S. You have enough $$ to go for the S, which is definitely the way to go, as it's not only got more engine, but more standard equipment. Much more fun to drive also.
Depends on how much car you want and how and when you plan to drive it. Boxsters are "roadsters", and are going to be noisier than 911's. If you must have a "rag top", then a 993 Cabriolet or even a 1999 996 Cab might fit your budget.
Whatever you go for...a prepurchase inspection is a necessity, as buying the wrong pre-owned Porsche can result in a remake of that old movie, "The Money Pit".
Good luck...