I was wondering if there's some way for me to see how bad my current card is (GTX 9800+) compared to newer cards. Like a website with loads of cards and general performance figures so it's easy to compare?
Your 9800GTX+ is roughly comparable to a geForce GTS450 or radeon HD5750/6750 which are both lower mid-range cards. It is no longer a top end card but it will still run most games on medium settings. Of course the 9800GTX+ will use much more power and run much hotter than a modern equivalent.