32 bit M14 to 64 bit Prime 2.0 Upgrade Concerns

I'm running Mathcad 14 M020 (single user license) under Win 7/64, using it to process experimental data. We recently upgraded the apparatus; one of the side effects was that the data sets grew. They are presently in the one to two million point range, and are expecting to grow further. I have seen and lived with all of M14's memory issues, which are well described here http://communities.ptc.com/message/17779

I've been very tempted by Prime 2.0, which I understand is available in a 64 bit version. Before I make the jump I'd really appreciate it if some of you who have gone before would share your experiences. Specifically:

Can 64 bit Prime 2.0 handle larger matrices than the earlier 32 bit versions of Mathcad? My M14/020 runs out of memory when its usage (monitored with Task Manager) reaches 1GB (+/-15%). I have 16GB in this workstation, and I'd love to be able to use it!

Can Prime 2.0 plot large matrices? I thought I read in a thread once that it couldn't, but now I can't find the thread.

Is vbScript scripting capability available in Prime 2.0? I use it for an input file picker dialog which is very quick and convenient, and I'd hate to have to give it up.

I've read that importing earlier version worksheets into Prime 2.0 requires that M15 be installed. I have a boatload of M14 worksheets that I cannot do without, but I do not have M15. Has anyone else faced this problem?

I'd be grateful for any advice. Thank you.

Steve