I suspect that the LLT is a better performer, but if you'd like something a little less in size and cost, you could also try this
one.
Also, if you have space for an IB, that can be done for very little as well.
- Nady XA-900 $150
- 2x Mach 5 MJ-18 ~$190 (includes shipping from Canada)
Getting up to 4 drivers would be ~$370 -- and would be recommended but busts your budget by $20. Also, my understanding is that there is supposed to be an American distributor for these drivers sometime soon (March?) with their new updated driver so their shipping costs could be a lot lower. Not sure what the pricing would be on the new drivers, but based on the rest of their offerings, it should still be way cheap. Of course, these costs do not include any of the "small items" needed like wiring, MDF, etc.
JCD