I’ve had a 1966 MGB, two 1977 MGBs, a 1977½ Porsche 924, and a 1979 Porsche 911SC. I have a '66 MGB undergoing restoration now.
1966 MGB (Mk.I)
A chrome-bumper classic. It wasn’t fast. “Book” top speed was 105 mph. Yes, it would do it; but it was most comfortable around 60 mph. Handling was great, and the exhaust note was splendid. It got some attention, even shortly after the end of the MGB’s 18-year run in 1980 (which is when I “inherited” it). Could have used an overdrive (which is available.)
1977 MGBs (Mk.III)
One of them had an overdrive, which made it much nicer to drive on the freeway than the non-overdrive ones. The '77s didn’t handle quite as nicely as the '66, and they didn’t have much power due to attempts to meet EPA regulations. (The '66 had 98hp.) The '77s also did not sound as nice as the '66. On the positive side, the convertable tops were nicer.
1977½ Porsche 924
Everybody hates the lowly 924. Actually, it was a good car that only suffered by comparison. Had it been badged as a VW or an Audi, everyone would have been singing its praises. The 924 was well balanced, and it was faster and (IMO) handled better than the MGBs. The rear area was handy for carrying stuff, too.
1979 Porsche 911SC
This car was a blast to drive. Gobs of power, and great handling with its Bilstien Sport Suspension. The only problem with it (aside from expensive routine maintenance and the occasional – expensive – repair) was that it lacked space. True, it had more space than the MGBs; but my needs had changed, and I needed something bigger.
All of these cars can be had for a reasonable price. I’d avoid the 924 and get a 944 instead, if you’re so inclined. But there are plenty of 911s in your price range.
A classic MGB is fun to drive, but in a different way from the Porsche. Got for a chrome-bumper for full effect. A Triumph TR6 might be fun, too; and it has a 6-cylinder engine.
The Mazda Miata is often called “The MGB that works”. (Actually, MGBs aren’t as bas as I and others jest.) I’ve never driven one, myself; but I hear they’re good little roadsters.