You are also going to want to be very wary of Marth, as he pretty much dominates Ike. Toon Link does well also.
Marth does well vs pretty much every opponent, however only goes slightly better or even at best with most characters...His biggest worry is Snake, who gives him a hard time.
If I were you, I'd pick up a character with a projectile. Maining 2 characters with no projectiles doesn't give you that much variation. Also, if you need Marth advice, come to the Marth boards...My Marth is nice, so I'd be able to help you out a lot. Also, my friend Emblem Lord knows a crapload about Marth. We can get you hooked up, son.
Playing Marth at a high level is definitely not easy, either. He requires precision and near perfect spacing. Easiest to pick up would probably be Wolf, then Marth, then Fox...Easiest to play at high levels, IMO, would be Wolf, Fox, Marth. Marth is very match up based, and can't do the same thing to everybody, for the most part.
Also, don't think I forgot about your Vaporeon Light.