New imaging setup...

For Xmas the Wife says I can spend some ching Naturally it will be on Astro gear, so I am planning a new imaging setup, here is what I have in mind

Celestron C8 tube I already own
Orion Short Tube 80 for a guide scope
Meade DSI for guiding that I already have
Canon EOS Xsi purchased new
Celestron ASGT mount

After a brief discussion with Herb( I will be purchasing the Orion tube and the mount from ATWB) I got the impression that the CG5 will be the weak link. Would it help this mount if I put it on a permanent pier that I already have installed? Also, how exactly does one go about autoguiding this mount with a DSI?

On Edit, another option is replacing The C8 with a WO Zenithstar 80 for a lighter setup, but that is a question for another forum....

I have a similar setup, and recently purchase an ASGT as a more portable replacement for my LX200.

My portable hardware is:

Celestron C80ED
Cannon 40D (piggyback when guided)
Meade DSI for guiding
Celestron ASGT

I am interested in the guiding software you will use. I have PHD and GPUSB I use with my LX200, and am wondering if this software and/or hardware can be used with the ASGT.

Also what "starmap" software to use to point to an object.