You didn't mention what type of diving you are going to do.
If you are going to dive sporatically, mostly once it warms up, then go with a wet suit and buy some cylinders. That will cost less than the dry suit unless you stumble on a really good deal.
Dry suits are generally much more of an investment, but expand the range of what you can dive comfortably. Yes I know there are a few people who will go diving in wet suits when there is ice on the lake, but most people can't handle that kind of exposure to cold. Nice part is a dry suit can be used even when its warm, as well as cold.
If you are going to start diving with a dry suit, particularly in cold water you should determine if the rest of your gear is suitable for cold water. In particular cold water rated regs, and a BC that can handle the weight needed to get you under with really warm underwear. Cold water BCs frequently have much more lift than smaller warm water BCs, not to mention integrated systems that can hold more weight.
If you are thinking of starting on even recreationally visiting wrecks, where it is generally cold a dry suit makes a lot of sense. Particularly down deep.
Keep in mind many people do get bored by the exciting lack of anything beyond wrecks to see when diving quaries and inland lakes. Lets face it how many times can you see a sunk boat or car. Those of us that keep at it often do so to keep our skills sharp, find something else to look at, or just like the feeling of being weightless. Whatever the reason figure out how much you will be doing, that may also help drive your decision. Do you want to invest a lot of money on a dry suit that you only use a couple times a year, or will you be doing a lot of diving that makes it worthwhile.
