Can I get steam on my computer - start up my own account - and pre-download the game files so that when he comes over and logs in as himself we dont haveto wait for all the files to download?
Nope. I looked into doing that as I was a little afraid of dropping my $59.95 only to find out that the throughput sucked ass and the download was going to take 2 weeks. You cannot pre-cache the files, and THEN purchase.
On the plus side I finally made the jump and I've ordered the silver package through steam. I'm happy to report that the throughput is averageing around 225KB/sec. Now I'm just going to have to leave the house so I don't sit here staring at the progress monitor all day.