I've never been a fan of bulldog. I installed a bulldog remote start/keyless entry for a guy in the shop. He provieded the new unopened package (just like the link you sent me) and it was missing a hood pin saftey shut down switch and one of the relays were bad right out of the box. I had to forgo the safety switch for the time being, and he went without parking lights flashing when it remote starts in order to use that relay for the ignition system.
Not sure on the other link, I've never use it.
While you are at it, why not install a remote starter with keyless entry?
The brand which I've installed a few times and like quite well due to its quality is ultra.
http://www.ultrastarters.com/
And here is a link to just an ultra keyless entry, no remote starter.
http://www.ultrastarters.com/products/ke_5.html
I have also heard good things about scytek, though never used them.
http://www.scytek.net/