http://www.asus.com/products.aspx?modelmenu=2&model=1343&l1=3&l2=101&l3=345&l4=0

or

ASRock ALiveNF5-eSATA2+ for £35

http://www.asrock.com/mb/overview.asp?Model=ALiveNF5-eSATA2%2b&s=AM2

It's to be used with my AMD Athlon 64 - 4800 DualCore

These are selling cheap second hand, but believed to be in good working order.

I don't know much about motherboards, which one would give me the best performance for my money?

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please buy from newegg. all other places are a rip off

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I have gotten stuff cheaper from both Geeks.com and TigerDirect.com (and in store).  And I have gotten stuff the day after I ordered it with 3-10 day shipping.  But, Newegg and TigerDirect end up being about the same price.

On Topic:  I'd go with the Asus, bit better brand but both are good.

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Changing the Tempo's oil used to suck. Then I got
it lifted, and now I might as well toss the jack.   -FTF

Its your call, there really wont be much noticeable difference between the two.

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Heaven has a beer volcano and stripper factory
Hell is the same, but the beer is stale and the strippers have STDs