Most people do springs first but you cant go wrong with an anti-roll bar though. Id forget about getting a front anti-roll bar and just buy a rear 22mm seems to be the most popular size. As for the brand Neuspeed makes some good products but they are a bit expensive. Ive got a Suspension Techniques rear bar on my car and I like it just fine but will be shortly upgrading to a Comptech setup.
Some other good brands that you might want to look into are Progress and Ground Control.