Do a search for the Ogio Ty video bag. It has been discussed quite a bit here on the forum and is an excellent value for the price. It will hold a laptop, camera and a crap load of other stuff.
Check Kata Bag "R-103". I have been in India shooting a documentary in very rough situations with my DVX 100B and used this bag along with "R-102". They both have a laptop compartmrnt and are very protevtive. I highly recmmend them both.
LOWEPRO, my bag was about 130 canadian (henrys threw it in for me when i purchased my dvx.....)
its great, a laptop holder in the back, a tripod holder, a bunch of compartments, i lost my dvx in my lowpro bag once because there are so many pockets
I LOVE my Kata HB-207 Hiker backpack. Carried a DVX all over Australia and Southern Cal. The pack is larger than the R-103, but I highly recommend any Kata bag. I went with the hiker because I liked the suspension support with waist belt.
Love this bag - especially on rough terrain. The laptop compartment is a bit thin and is directly on your back, but functional.
I use a Lowepro CompuTrekker Plus AW that was made for photo. But I can fit 2 DVX's and a laptop and extras in there no problem. I highly reccomend it!