Do not buy the Thomas set... TOO overinflated/expensive.
My sister, bought this one for my son:
http://www.toysrus.com/product/index.jsp?productId=3140254
AND my friends who have Thomas train table sets, says that they WISH they got this one instead... it is CHEAPER, more fun, better all around, AND their kids like my Son's train table set better too.
This brand, Imaginarium, is VERY well made & we have had NO problems with it whatsoever and my son LOVES it. AND it comes with EVERYTHING you see in the picture. AND the train noises are not OVERLY loud... just cute train sounds that are fun for kids and does not even bother my ears. My sister got it from Toys R Us as well .
AND yes the Thomas tracks and this one, IS interchangeable. I even bought extra wooden train tracks from Ross.... and it still fit my Son's set.
I really recommend this one.
I don't know about Target's set, but I know Circo makes great kids clothes.
All the best,
Susan