I think you'll be struggling to get one they haven't been made for a while. How much do you wish to spend? You could get something like a 6600GT for just over £100. Have a look here as an example of some you can get click here or click here or click here
Graphics cards have moved forward in 3 1/2 years and prices have come down. I now have the 6600GT, having upgraded through the Nvidia Geoforce range periodically - being at the trailing edge of technology means that I usually spend around £100 on a card each couple of years. But each card I buy is far faster than the last.....
The 6600GT is a brilliant card, but thinking about it the drivers not a problem, if you use the latest Nvidia driver its the same driver for all cards but, I've got a PCI express one and now I'm wondering if the AGP version needs its own power supply. Can anyone on the Forum comment on this? I found a good deal on a FX5600, let me go and check if they still have them and how they compare to what you already have. I'll post back in a min.
We crossed there. Totally-braindead is right in what he says. My last card was the 5600 and the 6600 is noticeably faster. Provided you go for the same slot (I presume AGP in your case) the card will fit. The 6600GT requires an additional power feed (T adaptor provided) so just make sure your power supply can cope (the card specifies what size power supply is needed). If you want to go down, I think the 5600 is still available for less than you are thinking of spending (though I'm not sure how this compares to a 4600Ti for speed) and this doesn't require a separate feed. The great beauty that I find with Nvidia Geoforce chips is that the drivers are the same across the range.
Yeah they still have them the FX5600, doesn't need any extra power and comes with 2 games, best thing about is its only £35.24 plus postage click here and its a little bit faster than your 4600TI was look here click here . I'd go for that one if you want to stay with something similar, plus its an MSI graphics card and they are good quality. The 6600GT is a hell of a lot better but it may need its own power supply.