New Graphics Card

I have a Dell XPS Gen 3 desktop.

These come with a 460 Watt PSU and an X800 XT.

I love the card, but it's time for it to be upgraded

I have an Intel Pentium 3.4 Chipset 925X Express

(4) sticks of 512 533Mhz (going to upgrade to (4) 1 Gig sticks, but not going to change my situation here)

80Gig HD

CD-RW

CD-ROM

I am contemplating purchasing a BFG 8800 GTS

I have ran a PSU calculator with this graphics card and it says "recommended" 460W

I think I am pushing it, but I have read some great reviews on this card and this card seems to be the best performance of choice and my budget.

I will not purchase a new case and new PSU (let's get that out of the way) If I purchase these I will just build a system of my choice

I am happy with my system, but I have been looking at cards for a few years now thinking it's going to be time to replace soon... and soon is here.

I am worried about my PSU not being able to handle the load of the card.

I have the space needed for the card.

The PSU info from my manual is this

Wattage 460W
Heat dissipation 931.2 BTU/hr
Voltage
fixed-voltage power supply --- 1 10V at 50/60 Hz

manual selection and auto-sensing power supplies --- 90 to 135 V at 50/60Hz; 180 to 265V at 50/60


Anyone able to give me some facts/links on better graphic cards for this system (not a 550W required graphics card please)

If I have to step down in model of Nvidia to accomodate my system or /// cough - grit teeth /// go to an ATI card, please give me a link to some benchmarks for a lower end card that still does good in performance