It's very possible to DI out of Link's U-smash before the last hit comes out. I play Link dittos with a friend and if I see it coming, I can smash DI the first 2 hits out of it. If you're near the tip of the u-smash, you can get out of after 1 of the hits. Smash DI is very strong. You smash DI the closest way out.
I wouldn't pick RC with Ike vs Link.. I'm not sure how exactly Ike plays on the stage with his aerial mobility, but I always thought that Ike was the type of character that controls the stage like a tank. Link has excellent stage control on RC with his versatile projectiles and Link can take advantage of Ike's recovery has much as Ike can take advantage of Link's.
BF is a good counterpick, Yoshi's Story is good too. I dunno about Lylat, it's pretty big and the platforms can help Link's projectile game. The only downside to the stage is really the lame edges can gimp Link, it's the same for Ike and almost every character, right?