I've been in the market for a new AM2 processor to replace the 3800+ dual core I already have. I'm not an extreme OC'r but from what I have seen on the market...I have a question.

Considering these two processors:

AMD AM2 Athlon 64 X2 5800+ Brisbane 3.0GHz 2 x 512KB L2 Cache
Socket AM2 89W Dual-Core @ $79 w/ free shipping @ Newegg.com

against this one:
AMD Athlon 64 X2 5400+ Brisbane 2.8GHz 2 x 512KB L2 Cache Socket AM2 65W Dual-Core black edition Processor @ $77 W/ free shipping @ Newegg.com

Now I don't mind an extra .28 Ghz coming out of my processor if I can do it without heat issues and it runs stable and that's what I hear most are getting on the black edition 5400+ @ 10% OC'd. However, I see that the 5800+ is already set @ 3Ghz. I am not into OC'n big and heavy but it'd be okay to have a bit more 'umph'.

I also see the wattage compared...65W against a whopping 89W! What's the pro's and con's on that?

Are they getting more out of the $2 less 5400+ than a 10% OC?

Is the 5800+ OC'able?

Is the wattage a major problem requiring a high end power supply, especially if I end up running twin Crossfire GPU's someday...or would my 550W Okia still pump alright?

Thanks in advance for any tips and answers.