Subaru axles are quite simple and it's not hard to avoid the problems with axles, I have a 100% success rate by sticking to #1 and #2:
1. reboot your Subaru OEM axle.
2. get a used Subaru OEM axle and reboot it. they're only $25 - $33 is the most I'll pay, I do it all the time. Car-Part.com--Used Auto Parts Market
3. EMPI gets the best reviews from folks doing a lot of Subaru axles. General Disorder uses them over on USMB and he owns his own shop and is a hardballer when it comes to quality and reliability.