Just got back from Aruba. Based on ScubaBoard recommendations, I dove with Clive (DiveAruba) and I'm glad I did. We dove on a pair of wrecks: the Pedernales and the Antilla and it was an awesome day. Clive is a cool guy and a plain-speaker who meticulously runs his small, privately-owned dive charter. If I am ever back in Aruba, there's no doubt, I'll be diving with him again.
We stayed at the Renaissance Marina, which was an exceptional value (through JetBlue packages). They run a private launch service (every 15 min) to their private island which offers some incredible snorkeling/freediving. We explored a few of the islands most famous beaches, but this little island was easily the best spot, in my opinion.
Red Sail offers shore dives (for like $20) off the island, but unfortunately I was there when the divemaster wasn't. So, I just enjoyed some freediving on nearby reefs and a sunken WWII barge. It was an awesome time.