For a brand new 2010 QD II.......YES!!!!!!!
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10k would be a nice torque y 392 stroker for your 06...or upgraded dana 44 front diff with 1000 hp axles also with a built torque converter and exhaust and ported heads and a cam and a 180 degree thermostat and labor.
I guess you know how i'd spend the 10k
It absolutely makes no financial sense to trade, and you have a great XK, but........
I think this is going to be one of things that bugs you until you make the move. I say if you can afford it, go for it. But it will be more than $10K because you'll have to put another $2-3K in upgrades. Just make sure whatever you get has every possible option on it.
Either that or buy a 2010 and keep the '06.........easy for me to say.