Don't hold your breath on the memory upgrade side of things, its not a simple job.
It may happen, it may not.

Better to buy a 128MB unit for your requirements now - there are plenty of Progears for sale around the place [and not just Ebay].

Theres a Progear newsgroup on Yahoo that has lots of Progears for sale as people get rid of the ones they bought for all sorts of reasons.

Average price seems to be $450 to $550 depending on accessories [like spare batteries, docking stations, amount of RAM etc].