I've got an American-made boat, run all American-made reels (Penn) but you can't beat the Scotty electric downriggers... I've got two, my fishing partner has one, so we normally run three on my boat, I've got nothing but good things to say about them.
Doug is right on the money telling you to go to
http://www.berrysbait.com, I bought one of my riggers from there, ordered it via phone, it showed up the next day, if I remember correctly (couple of years ago). Recently another guy in our fishing club ordered one, same thing, no problems.
All the Scotty stuff is made on Vancouver Island, in Sydney or Victoria. The only place I've seen that had prices better than Berry's Bait is "Gone Fishin'" in Port Alberni, but the prices were only better by $5 or $10 Canadian. If you're really into it, you might call around and find a tackle shop in Victoria or Sydney, they might be a little cheaper, too, but I've never tried.
Check out the Scotty website
http://www.scottyusa.com and take a really close look at the model #1105, this is the 60" retractable arm one, they made changes to this one in the past year or two, it used to be a 48" retracable arm, and the boom diameter used to be 1", now it's 1.25" and stronger, and it also has an upgraded clutch system. I've seen some stores in the states that are still selling the old ones, they have a red clutch handle.
At Berry's, the #1105 is $490 CDN, or about $315 US, while the "ProPac" version (which comes with a lot of cool stuff you're going to wish you had anyway, like the swivel base) is $560 CDN, or about $360 US.
I've got a 19' Custom Weld, and I have two 48" arm riggers with swivel bases, I wouldn't go with anything shorter, and I don't know what I'd do if I didn't have the swivel bases... remember, you can retract those 60" arms really far in if you want... even farther if you don't use the built-in rodholder... check it out at Outdoor Emporium, buy all your Penn reels there, but buy you downriggers and accessories from Berry's. (they have good prices on all the clips and stuff, too)
-N.