I would suggest you to at least look at the Bagaboo bags. I bought the large Workhorse pro a long time back and it has been great. In retrospect I likely would have been content with the medium, but the large is nice sometimes. It probably took a month from the time I ordered it 'til it arrived from Hungary to Atlanta. It can be an extremely good deal depending on the Euro to Dollar exchange rate. I was fortunate to get mine before the dollar took a huge dive, and it ended up being far cheaper than similar REload, seagull, and baileyworks bags even considering air mail costs. They were very pleasant to work with and answered all my questions in a timely manner. Regarding the strap, it is very comfortable, and there's a 2nd shoulder strap to make a backpack for heavy loads. I rode with a 30 pack of beer, bag of chips, loaf of bread, change of clothes, and my school books and it was comfy. It has been raining essentially non stop here for the last 3 months and none of my things have gotten moist.

Just my suggestion.
Of all the bags out there, I'm certain they are all excellent and will more than exceed anyone's expectations.