All Mac laptops come with iSight. All iMacs do too.
As to which one to buy? There are many, many threads on this topic already.
It all depends on what you want it for. MacBooks are cheaper but a bit more lightweight in power. MacBook Pro's have more power but are larger and more expensive. They all come with the same software.
Look around the forum and see what advice others were given.
Cheers.