aperture fever is a cruel mistress, you know as soon as you see something through the 8" you will be thinking "i wonder what this would have looked like through the 10"
i have a 12" but have plans to get a 16" in the very near future. In truth the 8 is a good cornerstone, and the starting point of many an amateur, and Eric raises a very good point when he says that the images from it will far surpass what you will see now, that said, and please dont take this as nasty, but anything pretty much will far surpass the views from a 70mm refractor, dont get me wrong, nothing wrong with it, and i am sure its a quality instrument, although in its current guise its probably limited to the the bright planets, and the brightest DSO's
Buy what you want. its that simple. if you want the 10, then buy the 10, if it means a few more weeks waiting, then so be it. Have a look in the IIS classifieds there are always great bargains in there, and i have yet to see anyone on here sell a scope that wasnt absolutely loved and nurtured to death, so you can be assured of not buying junk
