Not sure what you want to spend, but I bought an Eagle Creek New World Journey about 6 months ago for $169. Its a travel pack, so it zips down the side. It also has a cover that zips over the straps for plane travel. Its got a zip off daypack, separate sleeping bag compartment. It works great. I think it has been discontinued though, here is a link to some other Eagle Creek travel packs:
Eagle Creek Packs
It definately pays to shop around the web - big variations in prices on close out models and such.