Mini-t steering servo

[A RC Dude]

Ok, my friend just got a mini-t and has been looking at upgrades. He said that the steering servo seems a little week so i'm trying to help him out in finding a servo. This is his first rc car and all he knows about brands and all is what i've told him, but i don't know much about mini-t's. so i'm looking for a servo that would help him out a bit.
What would be a good servo for a mini-t?
And he only wants to spend 30 maxx, perferably more like 20-25