Buying both a canister and an upright can often be expensive and impractical, especially in the states where a decent vacuum could cost you up to $2000.
I'm in agreement with the guys above, a canister with a powerhead would be the best option. That way, you have straight suction for bare floors and the brushroll for carpets. Personally, I'd stick with bags. Bagged machines tend to be more reliable. Sebo, Miele, Simplicity/Riccar and Aerus all have some great options available. As Rysn said, the larger capacity would pay off with the D4.
