I've seen a few second gen's with really low-profile rear spoilers and was wondering which model it's on and how much they'd usually go for?

Mate go for Lip spoiler they are rare but stands out.

How low a profile are you taking? I have a spoiler on mine, $36 from you pull it and it is the right colour!

http://www.aussiemagna.com/forums/attachment.php?attachmentid=43797

This the one you might be talking about?

http://img718.imageshack.us/img718/2575/photo10z.jpg (http://imageshack.us/photo/my-images/718/photo10z.jpg/)

http://img851.imageshack.us/img851/8504/photo14fj.jpg (http://imageshack.us/photo/my-images/851/photo14fj.jpg/)

http://img43.imageshack.us/img43/900/photo18zd.jpg (http://imageshack.us/photo/my-images/43/photo18zd.jpg/)