I would choose the Destroyer over Invasion. Invasion is balanced horrible and needs a lot of weight on your stabilizer to get it to balance better. Upon the shot it will want to fall back towards you.
I would get the Destroyer over the Invasion because of the price. My buddy just bought the Destroyer and paid $799.00. The Invasion was much higher yet there isn't much difference between the two. Also I don't like the way the Invasion falls back in your hand after the shot. It doesn't seem natural.
I shot both the Destroyer 340 & 350 last year. I was only getting 8fps more out of the 350. I went with the 340 which I absolutely love. I shot the Invasion next to my 340 this year. Both great bows but I'm sticking with the 340.