My wife and I have been looking into coming over to UA from DL. As a DL silver, she applied for a Premier match by e-mail this week and was approved within 24 hours. She must fly 7.5 K miles within 90 days to maintain status until 2012.
As a Delta gold, I'm probably going to apply for an Executive Premier match, which requires 15k miles in 90 days to maintain status through the end of 2011. I have to wait a few days before applying to be sure known trips will get me to 15K within 90 days.
Everything I've been able to read suggests UA does not offer a 1K match. If that is not true, and if 1K is seen as equivalent to DL platinum, I would be tempted to stick with DL this year and seek a 1K match early in 2011.