Not quite sure about the remotes. I think the latest craze is the Viper 791 I think. You can find it for 250 eBay, or even 200 here on SF if someone has it for sale. Add in another ~200-300 for installation and that's your budget of 500.
install time should be anywhere from 2-3 hours max for the 791vx. Anything above $150 to install the alarm is considered on the high side. The viper 791vx go for $320 installed at reputable shops (in Houston) and thats cheap. Stereo-FX in Houston has H-I member specials will do them for $269 installed from time to time and thats an "A" stock alarm and an authorized directed dealer. Doesn't get any better than that.
I would wait a while and get the Clifford RS5.5 which should be coming out anytime now.
i am an installer at circuit. those alarms only come with one remote. the reason is because they are so damn expensive and if you want another one you have to pay... cost of install for alarm/keyless/remote start shouldnt be more than $160. anymore than that is too much!
Most of the time those come with one two way remote and one regular remote. You can buy another two way remote, but depending on where at they can get pretty expensive. I saw one at Best Buy the other day for 139 and that was open box buy