One thing though. The etx-105 is a decent scope on a decent equatorial mount. I certainly wouldn't discount it for some astrophotography. The technique is to stack loads of CCD images together - say 100 x 16 second exposures. You'd be surprised how good the pictures are. 17th magnitude is easily accessible.

In addition unless you have a dark site, light pollution will limit even perfectly tracked long exposure work to no more than a few minutes.