I bought a laptop with enhanced RAM 2 years ago (6 gigs) in order to use 64-bit capabilities. It's been $100 of wasted money for me as of yet, and with the laptop being finicky due to all the travel I do with it, it's tough to justify doing it again next year.
(With my current job, I intend to buy a laptop every 3 years)
Honestly, I'll be disappointed if 64-bit Elemental or GCIII doesn't happen.