I don't really aim for curl definition but this might help. I'm pretty hair lazy so I only do wash n gos and I've used different products on and off:
If you go to a regular BSS instead of Sally's they'll have a wider selection of Eco styler with different holds. I only use the clear or olive oil when I pull my hair back because they have a hold of 10 or you can put in a bit of serum/oil to lessen the crunch for a WnG. But otherwise I use a blue one with a hold of 5 I think for colour treated hair, it dries softer.
I like Eco styler, it's the cheapest gel around and it works but the PJ in me keeps trying different (more expensive) things
. But I'll only mention non gels here.
Herbal essences
Totally twisted mousse
John Frieda
Take charge curl boosting mousse
Suave
Healthy curls scrunching mousse (compare to redken)
Simply organic gurl
Curl defining crème (I got this on clearance at Target not sure if it's available anywhere else but I really like it)
I've used a couple of Marc Anthony products that I get from Ulta, the
Curl Defining Lotion and
Curl Envy Perfect Curl Cream
Suave
Sleek anti frizz creme (compare to Matrix)
GVP
Sleek look extreme styling creme (compare to Matrix)
There's probably more, I'll come back and eta if I can think of anything, hth.