I 100% recommend Ariat ! I love how durable all of their attire turns out. I've had a pair of padock boots from them for about 8 years now and they are still going strong. They look used but not horrible, I'll get a pick sometime. They can be on the pricy side (depending on what kind you would like) but I am sure you can get a steal on craigs list, ebay, or maybe a local tack swap of some kind?? My second pick would be Devon, I rode in a friends paid at a show and they were not too shabby at all.
Whichever ones fit the best! I would highly recommend going to a tack shop and trying on several pairs. Different brands and different models will all fit each person differently and you will want which looks and feels the best to you, esp if you end up paying up to $100. For schooling I like kerrits and tuffriders. For shows (hunter/jumper) ariats and tailored sportsmans are pretty popular. I'm assuming that if you want full seats you're more of a dressage rider though?