graphics card help needed

Hi allIm looking for advice on changing my card. I currently have a Geforce4 TI4600 128mb card which I really need to change. I don't have alot to spend on the computer as my baby daughter seems to take care of most of my money but I am looking at a radeon9600 256mb or another geforce equivalent ( Mx5700 ?) or something around the £70 mark. Last night while flying my Tu154 into Dussledorf I was achieving the great frame rates of 8 - 10 and that was while in the sky with no airport scenery visible and once on the ground my passengers would have been quicker walking to the gates from the runway. I know with my budget I won't achieve much but any improvement will be welcomed.I will appreciate any thoughts or comments anyone has as My knowledge on computers is limited on how to turn the thing on and off.Many thanksGrahamPs. what is the difference between ati and Geforce types of card?