^^This.
I am currently finishing my Nitrous Outlet plate kit. I didn't get the hardline kit at first but, after trying to route the stiff braided lines from solenoids to the plate tried it out. Unfortunately, I really couldn't get the bracket that they use for the hard line kit to fit well with my JLT CAI, and I do have the stock intake manifold. I went to the store yesterday and picked up a cheap pair of tubing benders and am going to make my own hardlines as I can't mount the solenoids on the plate for the Nitrous Outlet ones.
That being said, here's everything I picked up:
Plate kit
Progressive controller
Purge kit
remote opener
electric autometer gauge for my SOS pod
console mounted switch panel
I'll put a bottle heater in when the weather cools off but opted not to right now. The progressive controller is something I'd highly recommend. You're going to want a window switch anyways, so spend just a little more and get the progressive unit. Like onebadgsx said, you can dial in when and how much of the nitrous hits, so you could spray at 60% for the first 2 seconds of WOT and then have it come on 100% so you don't just spin the tires.
The console mounted switch panel is just badass in my opinion, makes for a very clean install.
If you were going to just go with the most basic setup you could, you could just get the kit and window switch with a pressure gauge that goes on the bottle. You're going to save yourself a lot of headache and time if you just go ahead and get the accessories you want now rather than later though. If you do decide to go simple, I'd suggest checking out instructions for all of the things you will get in the future and running wiring for them while you're doing the install later.
The most important thing I can tell you is that the guys at Nitrous Outlet have been EXTREMELY helpful. I knew just a little about nitrous kits and did the install myself. They were always available and answered ALL of my many many questions. I'd go with them hands down over any other company. Not that the others aren't great, but there is no way they could provide better customer service than Nitrous Outlet...maybe equal to, but not better. I went through Jarrod at LRS and got everything, I'd suggest the same to you as you can get the forum discount.