I have a keypad velcroed to my emergency brake and it works great. The remotes are pretty cool but hard to set up if you don't know how to build the receiver. If you're looking for something sleek and not too bulky, get a keypad with laptop-type keys. (I had one but the plug was some Compaq proprietory crap that I couldn't use.) They are very thin and have that cool laptop click sound and the cord keeps it from getting lost under the seat (those thin little remotes disappear easily).
The Impee3 Car Player