Used to be a climber..
Join Date: Aug 2005
Location: East Baldwin, ME
Bikes: 2016 Ridley Fenix SL, 2013 PedalForce RS3-ISP, 2015 Trek 520 Disc
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Sounds like you have some pretty solid goals. Personally, I think the 1000 would suit you well for a year or two, and then you'd probably want to start looking for something else. Doing it right the second time just costs more in the long run, so I would try to see what you can afford, and go from there. Go to some bike shops, test ride some bikes, and see what you like and don't like.
Between the two though, I'd definitely go with the 1500.