Vista 32 vs 64 bit cost

The versions that you gave links to are OEM builder versions. If you need support you have to contact the computer builder (yourself.) If you purchase the "Boxed" version from Microsoft, it with come with 32 and 64 bit versions and you can call Microsoft for support.

[edit] To answer your question: the 64 bit version is more capable.

32-bit and 64-bit Windows: frequently asked questions
 
Since the oem disks are sold separately for each flavor the vendor will often keep one up or mark one down a bit in order to see it sell. Newegg likely saw the $10 difference due to the 64bit being more of a hot seller with little activity for the 32bit especially with 7 on the way now.
 
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