Need advice on a hardware upgrade

[phprocker]

I'm upgrading some hardware in my PC and need some advice.

 

In about 6 months to a year I'd like to upgrade to PCI express.  Now this upgrade will cost upwards of around $500 due to all other components needed such as new MB, Power, Processor, and Card.  So, I was thinking to temporarily buying a new vid card because I saw a really good one very cheap.

 

I asked a tech bud of mine his advice if I should do this temp upgrade for about $150 and he suggests against it.

My current specs are this:

AMD Athlon 2800+

1 gig PC3200 Corsair

Geforce 5700LE 256 8x

450 watt power

n7n8x-x board

 

The card I saw online is a Geforce 7800GT for $150.  Dam sweet card but my bud says it won't help my system much. 

Can anyone help out and give me an idea of what kind of performance boost this might give with my current processor and specs?

[ober]

I'd be hesitant to throw that card on that PSU, personally.  Especially if the PSU isn't high quality.  I have the 7800 GT PCIX card and it runs like a dream, but throws a lot of heat.

 

My specs:

3.4 GHz Intel

2 gig 2.5 CAS latency RAM 533 MHz

Geforce 7800 GT 256 MB

510 PSU (PC Power & Cooling - quality PSU company)

Intel mobo

 

I'm also running 2 HDs.  Audio is onboard through an external USB converter.

 

My recommendation is to either upgrade the system or do nothing.

[jcombs_31]

I agree with ober, damn I've been itchin for an upgrade for quite some time now.  I still have an ati 9500pro 128MB, xp2500 and 1GB mem with an ASUS board.