Do you only use your miles to upgrade? If not how do you use miles? If you use them for business or first class awards on long hauls you'll find that with most other programs you'd fork over a very hefty fuel surcharge to redeem them. Again, depends on how you use the miles but with a random travel pattern it means you're flying a variety of carriers so you'll just be seen as a general * member anyway, for someone making 1k on UA I can't imagine any further benefit by moving. NH Diamond or LH HON Circle would be nice too but have requirements to make which you may not meet if you don't fly their metal enough.