The older 911s (in the 60's, 70's, and 80's) had the "S", "T", "E", "RS", "Carrera", and "SC" trim.
In the 70's, and early 80's the 911 had a 2.4, 2.7, and 3.0 litre engines. According to many 911 owners, the 2.7 litre engine had a lot of cooling problems due to the 5 blade cooling fan not getting enough air into the engine. The more refined 3.0 litre (1978-1983)is known to be a very reliable and "bulletproof" engine. The 2.7 and 3.0 also used the CIS fuel injection, opposed to later engines, like the 3.2 litre (1984-1988) and the 3.6 litre (1989-1998)which used Motronic fuel injection.
The Porsche 911 included a few different body styles, the Targa, Coupe, and Cabriolet. The Targa (produced from 1967 to the present)is a half coupe / half cabriolet trim that includes a removeable top, but a permanent rear window. The cabriolet, produced from 1983 on, came with Turbo and non-turbo models. The coupe was the first trim of the 911, and is one of the more popular trims.
The 911 Turbo (I believe from 1975 on)is a very expensive 911, and in the 80's, the Porsche factory would make a "Turbo Look", to sell a 911 that had the widebody, and the turbo tail, but no turbo engine.
Performance wise, Porsches are very fast cars, and very good track cars. For the older Porsche 911's (70's and 80's) the 0-60 mph time was from 5-8 seconds. The Turbo in the same year range could do 0-60 in 5 seconds or under, and the later models can do 0-60 in 3-5 seconds.
I believe that's it for the 911. I don't know much about other models, so I won't comment on them.
Porsche 924 S and 911 (964)
My 1983 Porsche 911 Cabriolet
Bi turbo Porsche... what ferrari enzo?
Porche GT2... really raelly fast car
Porsche also manufactured German tank turrets during WWII. The Pzkpfw VI King Tiger used a Porsche turret.