Should i get it?
 

Hey guys just wanted your expert opinions im looking at a 2006 mazda 3 sport for about 8000. It has a swapped stock engine with 30000kms on it and 160000kms on the body. Only comes with stock rims with winters on them. Check out the link and if someone could help me out that would be great!

http://classifieds.castanet.net/show...roduct=1090667

looks ok, check KBB.com for value. Unless you know it's good (professional) work that was done on the car, assume that it was hacked together - which can lead to major issues in the future.
Generally that price looks ok, but a lot depends on the option list as well.