Hi Dez
I think a GSO 10" scope is a great decision!
I have one and its been great!
When you decide which store to purchase from don't just look at prices. Some stores offer better service than others.
One thing to check which not many people talk about is centre spotting of the primary mirror. My GSO 10" did not come with a centre spot (which is totaly necessary for collimation). So I would be checking which Suppliers centre spot their scopes. I know Bintel collimate before sending out a scope, so I would assume they would need a spot for this, but I don't know so its worth checking first.
If your scope arrives without a centre spot it is not s nice job to do. If you look in the articles page of this site you will find a how-To for this.
I have done it successfuly but if you are not the hands on, practical type then it might be better to get one with a centre spot.
This is the only thing I can think of to check. Now you have decided on a 10" GSO dob you can't really go wrong in my opinion!
I look forward to reading your "First Light"
Cheers,
Dave.