My recommendations will not be the least expensive route, but IMHO will give you the best results for both looks and quality. First, forget about buying one of those cheap plastic or chrome plated pre-assembled towers. You will be much better served buying an unassembled tower and building it yourself with parts that are readily available.
Start by getting an unassembled stainless steel, two faucet tower from ACU
. They don't list prices on their website, you have to call them for a quote. They are great people to deal with. You should expect to pay around $60-70 for it.
You will then need to purchase some elbow shanks. I recommend the stainless steel elbow shanks from Micromatic
. They are a little pricey, but worth every penny.
My recommendation for faucets are to definitely get the forward sealing style, whether it be Perlicks or Shirrons. I've had both and personally prefer the Shirrons. Both of them are available at most of the bigger online brew supply retailers. I got mine from eBay, but the cheapest price I have found for them is at Austin Homebrew Supply
. You will also need to get two lengths of 3/16" ID thick walled, smooth bore beverage tubing. I would recommend going with at least 10' of tubing for each tap. You can always cut some off if it is too long. Depending on what type of kegs you have you will need the QD's and fittings that mate up to the kegs you have. I recommend going with the flare fittings over the barb fittings. It makes disassembly and cleaning much easier.
Here are a few sites that will provide a lot of info on kegging, from balancing the system to cleaning the kegs.
Soda Keg Maintenance
Draft System Line Balancing
Kegging & Carbonating
Bulk Keg O-rings
There are more, but that should keep you busy for awhile. Here is a photo of the end result. Of course mine is a three tap but you get the idea.