Hi Jo,.....Welcome..
I had a short tube 102mm some years back and I wouldn`t recommend it for your DSLR..like mentioned you will have blue halos around bright stars which is very unattractive..
Better of with a ED80...you should be able to get one secondhand here in the trader section if you are quick....and save a few dollars even if its in Ozz...
A HEQ5 would be a good mount for your budjet and you should be able to get short unguided shots for maybe a min or so with good alignment..
Later you could get that guidescope and all the extra goodies that go with it.
I was going to get a ED80 myself some time back but a TV genesis came along...
.....
Also the Ed would be a very versatile scope for the moon, DS and a look at the planets as well as a spotting scope in the daytime.
Cheers...
