The 4670 only uses a few watts less than the 5670. The 5570 performs slightly better than the 4670 and consumes about 20 watts less than a 5670. There is also the Nvidia GT240. This actually outperforms the 4670 and 5570 and consumes about the same amount of power. If you don't feel comfortable with a 5670 in your system, I would recommend the GT240 DDR5. DO NOT get the DDR3 version
Are you in the US? if not what sites can you order from?.
Granted you can get a more powerful card for the same money, but you would have to upgrade your power supply, if that is something you are willing to do.
Well, after some thought I have decided to go for a 5670 with GDDR5 itself (I will take a chance with the PSU as I have also heard that DELL PSUs can also take a bit of overloading, if need be). The reason for not wanting to upgrade the PSU is that I fear it might burn some other component/invalidate the warranty.
I am planning to order my card from ebay.in as I am in India currently.
If I don't get a good choice there I might choose other sites such as lynx-india.com etc.
Thx again for your replies