Hi. I've made a few posts in the past about switching by business from US Airways to another airline because, although US provides me with great service, the lacks of their route network can be felt.

But, since then, I've had a few great experiences with US Airways, which makes me want to stay loyal to them. But, since I fly between 100,000 and 150,000 miles per year depending on patterns, I think I can pull off elite status on another airline.

Most of my travel is in the US (all parts, actually) and Europe. I'm trying to decide what airline is best. The important factors are:
1. Ease of upgrades. I'll probably be in the lower or middle tier, depending on how I work out my travel. Since my business only pays coach for domestic travel, this is very important.
2. International comfort and service. I usually fly business, but if the flight is long, I can easily get my business to pay for First class (actually, technically, I could get First for all int'l flights, but I like to keep the leverage by picking only a few...). I've had great experiences with US in Envoy Class. Delta has a huge European network, which is important. Continental also is pretty large to Europe.
3. Airlines convenient to Tampa, my home. Since you have to connect to get just about everywhere, this is not really a problem. CO has convenient connections at EWR (Europe), CLE, and IAH from TPA. With Delta, fly a frequent flight to ATL and you just about have the world. AA has introduced new jet service to MIA, complementing their ORD and DFW service, and their Eagle MIA flights. Also they have flights to LGA, but they are more origin/destination.
4. Overall positive experiences with the airline, also recognition as an elite.

What airline do you think best fits me?

Thank you very much in advanced,
Chairman's Preferred