I have just revamped my rig to include the Fantom G8. I love Roland's hammer action, i think it's the best, and I love Roland's high-end piano samples. I think the whole RD series of stage pianos are trash. I've even played the new NX-700 and the action is slow, makes your forearms hurt after an hour, and the pianos are so backwards...you gotta EQ them forever just to dial in something useable.
I bought the G8 because it doesn't muck around with mediocre samples, like their more affordable lines. Also, I popped another $100 on eBay and got the ARX-02 expansion, which will let you customize your EP's until they explode with Wurly goodness. Seriously...look up all the youtube demos on that expansion board for the G series, and you will want to pick one up. I would make a demo video for you, but I'm in Japan for the short time being.
Good Luck