Personally, marine vehicles aren't good enough to really put your faith in them IMO. I'd much rather base my army around marines. I'm surprised that an Eldar player really thinks that a bunch of AV11 and AV12 armor is going to make the majority of you're opponent's army useless.
You can have the scout bikes, although they're not very fluffy in a Salamanders list. You can also have the two weapons on the bikes. Personally, I think 1 squad of bikes is enough. There rather a one-shot weapon. If you take them, they should have meltabombs. I don't think the idea of using the chaplain with the scout bikes is very good. I'm not convinced it will always work (you're going to hurt if you don't get the first turn), and it makes this a "trick" list when it does. Plus, if you're facing an army that's better than you at assault, it's a huge point sink for no real gain. Scout bikes are designed to harass soft units early in the game or kill tanks, while a chaplain is best used to to support the main body of a marine force in an assault.
Dreadnoughts aren't that good. One can be useful, maybe a second if you equip it for shooting, but three are just a point drain IMO.
The rhino squads need to be bigger to be effective (at least 8 models). They also need extra armor on the rhinos and veteran sergeants with at least power weapons (preferably fists).