Well in terms of a lot for little money bucketshred is righ on with the Monkey. It is a TS type pedal and delivers a big freaking load of value for the money. Boosts, tightens things up through the TS mid hump, and cheap.
If one of you is handy with a soldering iron building a Zves Super Hard On clone might be another option. That is purely a boost, and a very clean and tranparent one at that, but it also somehow seems to draw out more of pickups. A pure boost also does tighten up things a bit, but in a different way than a TS type. It is super cheap and easy to build and is just amazing.