If your basing your info off charts for a new game then of course your going to be confused. They will always score lower. If you plan to play Doom, save your monies and get a new card. Now if you plan to play some less demanding games, the 9500 and up will be a good pick. Most the actual ATi cards overclock well and are made pretty good. Now this is were it actually becomes confusing. Every manufacturer has dis-similar clocks, but they can range about the same. Powercolor is an alright ATi clone. They tend to be cheaper than an actuall ATi card and can overclock well. It kind of depends on the top end of your budget. With video cards alot of what you plan to do with it makes your final choice easier. If you want a basic gaming card no frills, and are willing to throw the dice in the hopes of getting a better card get the 9500 non pro.
If your not a gambler and want out of the box performance and willing to spend a few extra bucks, peek around for a 9800 of some flavor(256bit memory is a good thing, not to be mistaken for 256 megs of memory). Now this is were is starts to get confusing agian. The 9700pro will overtake the 9800se.
If you can get a card that has a 256bit memory bus of any flavor(i.e.-models), you will do alright in most cases. The coveted 256bit will do well in most cases and is usually a pretty good card for its class. It kind of goes like this in terms of bad to good. ls/se/vanilla(no fancy letterings)/pro/xt/. The pro and up in some cases can sometimes match the next higher model in terms of performance. Depending on the brand.
Now for pipes. The 9700pro and up will have more pipes to let graphics data through. The 9700pro will be a really nice pick for a budget card since it is close to a 9800 in terms of pipes.
If I am wrong on any of this I will correct it.