It's really not that complicated of a scenario. If you like the 6 string version, but consider yourself a 7 player, you won't be disappointed with the 7 string version. However, if you're still unsure I'd suggest buying online from a retailer with a return policy. But frankly, you could probably spend the cash on gas money to drive to a guitar center and play one and then buy Darren's and still come out ahead financially over buying one new.
Edit: I thought about suggesting Chuck's but you beat me to it Matt. Brian is indeed a very cool guy to work with. I went there looking for a new amp and he helped me with trying whatever the hell I felt like trying, and this is how I ended up with my Invader. Their prices are hard to beat too.
Edit: I thought about suggesting Chuck's but you beat me to it Matt. Brian is indeed a very cool guy to work with. I went there looking for a new amp and he helped me with trying whatever the hell I felt like trying, and this is how I ended up with my Invader. Their prices are hard to beat too.