I just got a Viper 5501 installed in my moms car. Amazing unit! Every bloody feature in the book. Comes with the flattest 2 way LCD remote available that, get this, has a replaceable internal li-ion battery that is charged via a mini-USB cord. No more buying batteries!
Its also completely compatible with smart start should she want the upgrade.
Came to $450 installed, all options, for a '10 VW jetta. Its cheaper than normal as i paid for the 2-way LED remote system but due to the unit being DOA they upgraded her for free, no charge. $100 difference.