Actually the Whites or Viking probably won't much more, if any, than a good DUI suit.
Shop around- right now is a good time because there should be some good deals out there from DEMA, but the deals won't last long.
Getting a vulcanized or other type of material that is designed for chemical exposure and for ease of cleaning can make life a lot easier on the cleanup, but as long as you're not using them to go into chemical contamination almost any suit will be better than nothing, particularly if you are diving in cold water.
There are some very low priced shell suits out there but as with everything, you get what you pay for. Durability on those will not match what you can expect with the better suits.
The main consideration for your new suits will be the water you will be diving in, if you have water that is chemically contaminated you've got to have full encapsulation and suits that can be decontaminated (Vulcanized or similar). If you're only concerned with cold then almost any suit will work with sufficient undergarments.
Good luck with the selection!