Let me give you a synopsis of everything (before Brian tells you to search!!

)
90-93 Q45 are known as the performance oriented cars.... However they arent as reliable (as the 94+) but still more so than many other cars in its class. HOWEVER, they have a potentially DEADLY problem with the CHAIN GUIDES. Basically what happens is these little guides are plastic, they break, and cause the chain to skip teeth... The VH45DE is an interference engine, and this can be catestrophic if not fixed with the updated guides.
The 94-95 are probably the most desireable. Many improvements in reliability (no chain guides to mess with), and they are much more plush. Softer springs, softer seats, heated seats, TCS, power headrests, and other things make these models more luxurious. They were however slightly detuned, so they arent as high performing (but still VERY fast)
In all, I would recommend a 94 or 95 Q45 to you... The 90-93 are best case 11 years old and that can mean a lot of abuse, plus chain guides... But if you want probably the best performing car in its year/class, and for the price, its absolutely unbeatable. For a daily driver the 94s are better (IMO). If you like plushness with performance this is for you.
Now for the options. The touring model on 90-94s had a rear sway bar, and the SUPERHICAS all wheel steering. Only noticeable at high speeds. The A models mean the car has ACTIVE SUSPENSION. It is a computer controlled setup and it makes this car one of the best handling cars in its class/year... However, this system is very expensive to maintain, but there is ABSOLUTELY ABSOLUTELY nothing like it. No body roll, pitch or squat during braking or corning (on a as new system)..
Depending on your budget and resources will determine what you need....
Spend some time reading through this forum, and the online mechanic and you will learn much more.... This is a group of very knowledgable people and we can help you every step of the way...... Set yourself down tomorrow with a pastrami sandwitch and spend a few hours reading through all the posts..... ITS THE BEST TIME YOU CAN SPEND, I ASSURE YOU. I was in the same boat as you were.!