Ike makes great housing, especially given the price. a possible downside depending on personal preference, is that ike housings tend to be bulkier. I travel alot, so I went with an all aluminum housing which is much smaller than Ikes, so I can fit my whole kit except the dome port into a carry on backpack.
Sea & Sea makes a half aluminum, half polycarbinate housing for a reasonable price, subal and seacam make the "best" housings, and you will pay for it. These are the big housing developers, your budget and requirements will determine what you should buy.
There are many factors such as TTL converters, port options and such to consider which should drive your choices. reccomend determing those options withing your budget, and compare and contrast options that are important to you.
It's a fun and educational process, don't think of it as a chore. I took 3 months to research the correct housing for my D200 before settling on the Sea and Sea. Remember, once you pick a housing, you will invest in that housing's gears, ports, and other costly attachments, so you will likely stay with them for as long as you are in the hobby, even if you upgrade cameras.
John