I'd probably go for the 130x900 but since you and your younger brother are beginners, I'd stay away from an equitorial mount (EQ), they're bloody tricky for learners. Try posting exactly the same question in the Beginners Start Here section. You'd be best getting a few opinions and it seems many experienced astronomers (more experienced than me) hang out there to advise the likes of you and your brother. Your post may have been missed by others in the equipment discussions part of Ice in Space. Many others like you ask very similar questions in the Beginners section. Remember though, magnification is one of the least important considerations. Clarity is far more rewarding. Don't rush things. Surf this site for at least a couple of weeks before committing. Have you considered binoculars? $350 would get a nice pair and a tripod for them. Binoculars have many advantages over scopes for beginners in my opinion. Others won't agree with me.
It's a big and initially very confusing hobby. Hang in there and read more threads.
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