Nothing against Northern Brewer (I order equipment and ingredients from them regularly), but I would skip that setup and piece together your own.
Taprite Dual Gauge Regulator: $65 http://www.morebeer.com/products/taprite-dual-gauge-co2-regulator.html
There are a lot of options for both new and used kegs. Here is one of them - 5 gallon Torpedo keg: $90http://www.morebeer.com/products/torpedo-ball-lock-kegs.html
Then you need one gas and one liquid disconnect ($6 each). I like the flared versions opposed to the barbed versions:http://www.morebeer.com/products/ball-lock-beverage-flare.html?site_id=9http://www.morebeer.com/products/ball-lock-gas-flare.html?site_id=9
You will also need gas and beverage tubing. I don't know what your setup is like, but I would get at least 5 feet of gas tubing. I would also get about 10 feet of 3/16 inch beverage tubing. Read up on how to balance a draft system to prevent foaming (it isn't very complicated and there are a lot of resources on the web; use more beverage tubing than you think you need, it usually doesn't harm anything and you can always cut it shorter if you want).
To connect tubing to flared disconnects you need a barbed swivel nut, like this: http://www.northernbrewer.com/brewing/kegging/tubing/clamps-etc/barbed-swivel-nut-k123
Then you use a hose clamp to secure the tubing to the barbed swivel nut. You can use the regular worm gear style clamps, but I much prefer stepless ear clamps for permanent (or at least semi-permanent) connections.
They look like this: http://www.northernbrewer.com/stepless-clamp-no-145-oetiker
They do require a special clamper. You can often find them on Ebay or other on-line shops for less than half of what homebrew shops sell them for. This is what it looks like: http://www.quill.com/oetiker-manual-closing-tools/cbs/258045.html?cm_mmc=CSE_SDC_258045&mcode=CSE_GGL_258045
Don't forget extra clamps to secure the gas tubing to the regulator and to secure the beverage tubing to your faucet.
I'm assuming you are planning to start out with a picnic faucet: http://www.morebeer.com/products/hand-held-beer-faucet.html
Also, for future reference, for any metal to metal connections you want to use a flared washer, like this: http://www.morebeer.com/products/flare-fitting-washer.html?site_id=9
You do not need flared washers for the connections to the disconnects, as the disconnects already have a built-in washer.
I think that puts you somewhere around $180 (assuming worm gear clamps instead of the stepless ones) plus another $15-$20 for tubing. That doesn't include shipping, though I think you can get free shipping from MoreBeer and NB has $7.99 flat rate shipping for a lot of items.
For a CO2 tank, I would call you local Airgas distributor and ask them how much to get in the program for a 5 or 10 lb. tank and then shop around on-line to see which is less expensive.
It's also a good idea to have a little keg lube on hand: http://www.morebeer.com/products/cip-film-keg-lube-4-oz.html?site_id=7