car alarm w/ keypad keyless entry

Yeah I'll probably just leave out the power supply and let the battery provide the power.  I do however like the Transistor idea.  With all the crap I've added, underdash real estate is becoming an ever-diminishing commodity.  Not to mention the fact this vehicle should be sponsored by Bosch with all the f-in relays it has on it.  I am nowhere near familiar with transistors like I am with relays.  In fact, besides my circuits and mechatronics classes I took in college, I've never used one.

So for the wiring on the disarm/unlock, will I hook one side of the unlook button to the collector, the other side to the emitter, and the keypad unlock pulse wire to the base?  I did some browsing at Radio Shack but I have no idea what to get.  I know they classify them by P-N-P and so on but I don't know which one to get.  I vaguely remember our discussion about transistors and diodes in a material properties class and know that this has something to do with the flow direction of the electrons, but I don't know which one I need.  Maybe someone could submit a part number?

One last thing.  What do you think would be the cleanest way to wire this up? By that, I mean like is there some sort of mini bread board or some sort of small enclosure that I could stuff all this wiring in rather than just having 3 transistors dangling under dash?  Thanks a ton guys.

So now I found out that most Compustar units come with 2 programmable inputs tha can be used for this.  Unfortunately, while this problem is solved, another is created.  I also have an electric retracting tonneau cover that I was going to wire up to be programmed by the auxilliary channels.  Compustar units do not allow the aux outputs to be used in "validity" mode.  Validity mode is where the aux output is active for as long as the button is pressed, which is ideal for my tonno.  Compustar only allows timed and pulse.  I know some of you will say "Well just use the timed!"  That doesn't really suit me because I'd like to be able to stop the tonno wherever I want, whether that is 1/4 open, 1/2 open, etc.  The other problem with timed is that there is such a temp variation here in Wyoming that on a summer day, it might only take 15 secs to open, but on a cold winter day, it could take double (or more) the time.

Therefore, I think I'm still at the point where I am gonna use the Viper and sacrifice a remote.  The outputs are more flexible and the buttons on it are actually intuitive, rather than Compustar's I, II, III, & IV.  The other thing I like is the Viper remote was specifically designed to be used with one hand (no two buttons pressed at the same time).  While this creates more sequences to remember, if you come out of the grocery store with your hands full, you can pop the trunk (or in my case, retract the tonno) without fumbling with your groceries.  So I'll let you guys know how it turns out.