Both the Kenwood TH-G71 and VX-7R support channel priority mode where if you're on one channel and somebody open sqwelch on another than you designated as priority, the radio switches over to that channel.
The other thing you can look at is with the TH-G71 it has a PTT hand mic that has 3 macro buttons on it that let you slave them to either a feature or a channel, making it easy to switch from one channel to another. Unfortunately I have not seen such a mic for the VX-7R yet, but if I do see it I am going to get it.
If I am doing comms and need to watch two channels closely, often times I will just use two radios. Yeah, it sucks, but channel priority isn't a convenient feature if you're managing a net, its good for emergency or host channeling, but if you're managing two busy nets, two radios is the only way I've found to do it most efficently.
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