need advice about gfx upgrade...yes another one

right, im looking to upgrade my gfx in the next month or so and would like some advice on what to get.

im not a power gamer, i just want to be able to play the latest games at a nice quality and speed cuz me monitor wont handle anything about 1200 x whatever it is lol.

im running an xp1800 palli (oc'd to 1.7ghz) with 512 2100 ddr on an abit kt400 mobo (8x agp) with currently a hercules 4500 prophet II.

yeah i know its a poor set up but it does for me :)

anyway i was thinking of spending around 150 quid, i have seen the leadtek 5900 lx for 170,

would this be a good investment as i usually keep my fgx for at least 18 months or until i really need to upgrade :)

and with the current games being dx9 required im finding myself replaying all my old games lol

any advice would be apprieciated

deano