How the experts do it? (kernel dev)

[klowd9 -]

I would like to setup a virtual machine for developing and debugging the 
kernel, perhaps with the possibility of debugging from the host os to the 
guest system.
Which software would best suite this: vmware, bochs, qemu ?
Keep in mind my host os will be FreeBSD 5.4. So whatever runs best on that.

Also, How would i setup the system, so at boot i could choose between two 
kernels?
One would be my Safe working kernel. And one would be constantly modifed and 
recompiled.
Then i could easily switch between the two at boot time.
Is there any easier way to test if a kernel works, other then running the 
whole boot process on a system?

Could i do my kernel testing on a virtual macined minibsd, or is that a 
different type of kernel and will not be valid in relation to freebsd?

If you use a better or more efficient method for testing new kernel code, 
please write it here also.

Thank you, Ben.