+/- 2MHz don't mean much. It's within the normal margin.
The Sapphire Atlantis edition of their Radeon 9800 PRO comes with 2.8nsec memory, not 3.2nsec.
Usually, you don't see this on web site, because Sapphire might change at anytime their memory provider, based on stock and price. At default GPU BIOS speed, any Radeon 9800 PRO will be clock at the same speed. The advantage of getting a card that have faster ram is for the overclocking potential. The Sapphire Atlantis with 2.8nsec memory chip can easily be clocked at 720MHz for the memory, because the memory support this speed.
But, as you stated, if you had good experience with MSI and their package is good. Get one!
By the way, when you will get your video card, use the official ATI drivers (<A HREF="http://www2.ati.com/drivers/wxp-w2k-catalyst-8-03-040610a-016126c.exe" target="_new">http://www2.ati.com/drivers/wxp-w2k-catalyst-8-03-040610a-016126c.exe</A> - Catalyst 4.7 for WinXP). They are the most up-to-date drivers you can have for your Radeon based video card.
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It's tricky to use words like <b><font color=green>AMD</font color=green></b> or <b><font color=blue>Intel</font color=blue></b> in a signature some users could think your are biased.