Just in the process of purchasing a 1999.5 A4 1.8T and I'm considering getting the 3rd party warranty. Anyone have experience with these?? Would you recommend getting warranty? the car had just under 70K. Thanks.

try to get how much it will cost you for extra warranty which is either 2/3 years for 80000/160000 kms through dealer...
they are few companies who offer extended warranties , dealer might have it as well, which they recommended... but with 3rd party warranty there are many options which can go from just 500 cdn to about 3000 cdn per year and they have limited coverege on parts/labour... which you need to look, what you need the most
here are some helpful sites you might check...
http://www.extendedwarranty.ca/index.asp
http://www.holmanins.com/business/warranty/mechanical.html
http://yahoo.iciwarranty.com/yahoo/pages/7secrets/secrets.html