Bored of my E-28

[Takedown]

Well I bought my 1984 BMW E28 533i about 2-months back and so far it has proven to be really tough. I am using it as a winter car and I love it. But I will only have it till around mid march-ish. I am looking to take out a loan for newer sporty car summer. I just need opinions on what you guys would suggest. The loan will be for $6000 so that is my absolute limit. I am going mainly for reliability and power. Dont know if that combo is possible at only $6000. I dont care about the age of the car as long as its in good shape mechanically and cosmetically and that its newer than a 1988. I prefer rwd with lsd. It has to be a manual! Ive been looking at mainly 240sx's, 300zx's, FC rx7's, E-36's, A4's, foxbody 5.0 mustang etc... Im an import guy for the most part. I dont like most american cars.

All suggestions greatly appreciated!