I believe most remotes are universal affairs, where the remote includes an adapter for your ASA so you can plug in the remote coil, and the remote coil itself, which has a cap on the other end so you can screw in your bottle and activate it with the top pin-activation screw. Most are coiled lines nowadays, as far as I know.
Some remotes come with a slide-check, which allows you to de-gas your marker instantly with a sliding mechanism on the coil connection to the ASA.
I personally use a Trinity remote coil with a slide check. It does its job well, and I got it for about $45. I definitely love the slide check, so I'd recommend a coil with a slide-check. You can get a cover for your remote as well, to prevent tangling and getting caught up in brush or whatever.
Here's some more info here: http://www.pbreview.com/forums/showt...hreadid=168712
And a list of reviews for a few, so you can get a basic idea: http://www.pbreview.com/products/cat/71/
GRAYEDIT: You probably won't ever have to worry about this, but still a word of caution. Do not use a remote if you're using an anti-siphon CO2 tank. Your CO2 tank in all likelihood is normal. Anti-siphoning is a mod for CO2 tanks that makes it harder for liquid CO2 to enter a marker, and is an option for avid CO2 users with higher-end markers. Using a remote with an anti-siphon tank reverses the purpose and causes a siphon, which is bad. Again, you probably never have to worry about this
. It's just a standard warning with remote users.