There are a lot of considerations when selecting LED lighting. You could go with LED strip lighting, but you'd need 2 or 3 strips to get the amount of light needed for corals. This kind of begs the question, what lighting do you currently have? Please give us specs and so on. The reason I'm asking is that I'm not sure any LED strip lighting would give you a big improvement in your existing lighting.
The other main alternative is pendant lighting. EcoTech, AI, and Kessil are the big players here, but there are other manufacturers that can work out well also. One thing about pendants is that they typically will light up only about 18 to 24 inches of a tank. LEDs tend to direct their light straight down, and it doesn't spread out that much. If you try using one pendant, you'll likely end up with dim ends of the tank, and this will be more apparent near the surface. Think of the lighting pattern as an "A", with out the cross bar.
If your going to go with pendants, I'd recommend getting two of them to span the 30" you have. It will look about 10 times better.
Selecting a vendor. Unlike T5, PC, and MH lighting, which can be repaired with off the shelf parts, LED lighting usually uses proprietary electronics. This means your at the merch of the vendor to supply replacement parts. If they can not, and you have a problem your out of luck. On the other hand, some of the unknown vendors are so inexpensive that you could just take your loss and replace the fixture.
If this were my tank, I'd likely go with two AI Prime fixtures. This would be about at the limit of your budget. You might also need to get two mounting kits for them, depending upon how you want to mount them. The one limitation of the AI Primes is that they may not be enough light if you want SPS corals at some point. You could consider a pair of AI Hydra 26 fixtures, but these would cost you a lot more money.
There are several other fixtures that would also work, but offhand I think they would cost more.