Rear End Options

[burnie6bt]

Hey I am looking at getting 3.73 and posi in a rear end. A local shop quotes $2k to do that work. At that price I can get a 9" kit from speedway motors. My questions are:
-Does $2k seem reasonable?
-Should I just get a whole new rear axle?
-Is there a good late model swap, minimal modifications? 14 bolt, Dana 60, etc.

Basic requirements: posi/lsd, 3.50+ gearing (3.73 ideal will have a 4l80e OD trans), need to hold 600-700 hp at the crank (current engine going in will be about 500hp but want room to grow), street driven cruiser minimal strip time if any. So sticky tires and suspension with a ton of bite is not really in the plan of use.

Thanks in advance!