Need your thoughts on a price quote!

[infamous212]

Guys,

I've noticed that when I go over a bump while turning right, I often hear clunk/thud(?) noise. So first thing I checked was a cv boot(outer) and discovered that rubber boot split in two. Therefore, I've visited a few local bmw specialist shops and got quoted as follows (part/labor):

1. Replacing the outer cv boot only = $450
2. Replacing with an aftermarket axle = $450
3. Replacing with a factory axle = $650.

What do you guys think about these quotes?
Is anyone here from austin, tx?

Any input will be appreciated!

(E53 '04 4.4i, front driver side)