I'm a really big fan of Levi's, plus they offer a wide selection of inseam lengths (30, 32, 34 etc). Another big advantage is that you can go by how curvy you are so they end up fitting really well! I often get the gap in the back of my jeans by going with other brand but with Levi's I don't have that anymore! If you don't have as much butt, though, don't worry because they have ones with less curve too.
I'd suggest going into a store and finding what size/curve/length works well for you and then looking online for sales. I found a really great pair in the store and did just that and saved a ton of money.
The quality is also really great, I've found they last longer than my other jeans (a big deal for me because I typically wear out the inseams quickly thanks to my thighs rubbing together.

Levi's don't do that for me, though, so it's another big plus.
FWIW, I really don't like old navy and gap jeans. there's way too much stretch in the material and by the end of the day they're falling off of me. Levi's don't put as much spandex in the material so they hold their shape better.
ETA: ITA on buying them tight. You want to breathe but even the best jeans do get loser by the end of the day. also, if you still have any to lose they'll loosen up over time.