Try Yuzo over at uwdigitalcamera.com or you can also try divervision.com
I'll shoot live view when I'm going after fast moving animals (fish for the most part), use the viewfinder if doing reefscapes or macro or slow moving animals (crabs and nudis...etc.). I wouldn't shoot in live view exclusively as that would drain the battery too fast. Note however this this is a new system for me and I'm also still learning it.
As far as upgrade path...well, IMO, it's a consumer electronic item. That means, something will always be better. If the camera and lens combinations that you can get now produce images that please you now, why should they not do the same in 2, 3, 4, 5 or longer years? I've given up on trying to have the best available electronic equipment, it's a money hole. I buy when I like at the time and is within my budget, and then don't look at any of the new models until my current model breaks or I find it limiting in some way. My old G10 lasted me 5-6 years, and I've had the SL1 for 1-2 years, and don't see myself upgrading anytime soon. When the time comes, there are already rumors of 150d/SL2 sometime soon.
Heck, I still have an old galaxy S2 phone going on 4 years I think, and it's going to die before I get a new one, it does all the things I need it to, no reason to spend more on an upgrade.