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8 versus 10 is a good question...
You will get more light gathering ability with the 10...but, it is more expensive and a bit bigger to lug around...and maybe it will need to be collimated more often...
My advice is for you to get the one that you will use the most.
Sounds like "wimpy advice"...but, the extra aperature will not do you any good if you do not use it...
While some will mention how "portable" the 10 inch is...I own an 8 inch and sometimes after a long day at the office I am not too keen to move it (yes, I do have a hand trolly see Ice's modifications and projects)...
For me, the 8 inch is a good place to move to from where you are...it is much biger than your current 4.5 so it will open new things to see...it is "portable" (in a relaxed sense of the meaning) and you have a few $ to put toward some other gear...
Good Luck with your choice...
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