I've tried several, and also settled on the Incase and Apple keyboard...
The Incase is an ipad stand, and a keyboard case. I prefer the Apple keyboard, even though it doesn't have a home button that I could find. I can easily continue to use my smart cover. It sits well on my lap. The keys are separated and easy to use. Unfortunately, I have to carry the keyboard and ipad independently, but that hasn't proven to be a big deal since they both go in my bag. I don't use the keyboard as often as I just use the ipad as a hand held device, so this arrangement works perfectly for me.
I hope this helps, and saves you from buying a bunch of cases like I did.
As my response above implies, that's my solution, as well. I, too, like the Apple keyboard though the Microsoft 6000 Mobile keyboard is superior in several ways, I think. The Incase "Origami Workstation," though oddly named, is an excellent solution for those who want to combine the iPad with a SmartCover and back protection with the Apple keyboard.
As far as bags are concerned, I use two.
() The Timbuk2 Freestyle Small Messenger bag is highly functional and very durable. I originally got one on sale for about $35 for a netbook I have. Unfortunately, the interior sleeve was not quite large enough for the 11 inch netbook. Fortunately, it turned out to be perfect for the iPad 2. Holds the iPad, the Incase keyboard case, accessories like headphones, cables, etc. and can even carry a water bottle. Runs about $50-$60 on Amazon at the present time depending on the color combination you choose.
This would also work with other stand/keyboard combinations such as the Microsoft 6000 mobile keyboard and the Joby stand.
[ame="http://www.amazon.com/Timbuk2-Freestyle-Gunmetal-Cement-X-Small/dp/B003R2MNWG/ref=sr_1_2?ie=UTF8&qid=1307975813&sr=8-2"]Amazon.com: Timbuk2 Freestyle iPad/iPad2 Messenger Bag: Clothing[/ame]
() When I travel on business I use a Travel Express case from Waterfield Designs that fits in my Cargo bag (along with my 15" laptop) from the same folks. Again, very durable, good looking, and professional. Holds the iPad and the Incase keboard cover/stand along with essential accessories and looks better in a corporate environment than the Timbuk2. Relatively expensive but I've had a number of products from the Waterfield folks and their stuff looks great and literally never wears out. (half a million travel miles on the Cargo bag and five years and it still looks brand new.)
iPad Travel Express - SFBags - WaterField Designs - iPad 2