The major thing you are missing is good lighting. (Besides the test kits.)
The power heads, and skimmer are good.
The wet-dry could be converted into a sump, which is good.
A quarantine tank would be another good thing to have.
Yes, remove the undergravel filter, but do it slowly. Remove about 1/4 of the crushed coral each week, and when it's all gone you can pull out the plates. If you can, replace the crushed coral with argonite sand (Carib Sea sells the expensive kind, Wal-Mart has "white play sand" manufactured by "Old Castle" under the brandname "Kolorscape" that's the same stuff only cheaper. Don't be scared off by the warning on the white play sand that it shouldn't be used in aquariums.) If you're not going to replace with sand, you could just remove the uplift tubes. The plates won't hurt anything, it's the crushed coral and the circulation pattern that need to change.
seaham358 - Don't be so harsh. The first post on this thread was yesterday, we've already emphasized the importance of test kits. Not everyone has an express train to the LFS and an unlimited bank account. The foodstuffs are already on hand, so that's all we have until the test kits come.