I would really like the option of either assembling files in memory or the option of a custom temp directory that I can place on a RAM disk.
I'm using 10 connections to saturate my 60+ Mbps line and when that is combined with R&E, the disk is hammered continiuosly. It is especially a problem if other programs want to use I/O at the same time.
I really don't care about a high memory usage. Use all you can! Putting 16 GB of RAM in my new machine is now less than $200.