Hopefully by Spring 2009 there will be a new shoe brand to suit many of your needs. It's been a challenge that I have been working on for the last 9 months...that's all I can say for now
All the shoes mentioned above are very good shoes. In our research the Merrell shoes have always come out on top for value and quality. Keen are very popular and make for a good casual shoe. Their sandals have good protection but many also have an issue with sand or dirt rubbing against the foot...a problem inherent with all sandals.
Montrail makes a great product. The last they have developed is one of the best fitting and they are very lightweight for all the support they offer (my personal favorite). They were bought by Columbia and it will be interesting to see how their future bodes.
Salomon has great styling but we have heard complaints that they are narrow in the toe box (except the water shoe...another favorite of mine).
Nobody mentioned the brand Ecco. Check out
www.thewalkingcompany.com (no affiliation) and take a look at what is offered. Ecco make great casual shoes and sandals that are also technical. They are pricey but well worth the money. After destroying/researching many shoes the quality of Ecco is now a benchmark for what we are striving to accomplish.
After interviewing various guides and explorers it seems that packing 2 shoes is ideal. A multi purpose shoe that has protection and a sturdy outsole along with a pair of sandals.
Cheers,
David