2-Way Remote Start. Trying to decide on one

I'm in the market for a 2-way remote start, maybe even that iPhone remote start as well if it's not too much more. I wanted to see what your guys thoughts on the systems were.

I found compustar and viper which were both around $400 installed with a 2way communicator. The smartstart (viper iphone app) would be an extra $250. Drone (compustar iphone app) seems to be way more expensive at around $1000 installed.

Any good recommendations or info on remote starts? I would probably want to either tie it into my current alarm system or just get an aftermarket alarm which would cost more but I want everything to work off the same remote.

Any info is appreciated! I plan to get this somewhat soon after I make up my mind. Thanks.