Let me start by saying I LOVE my Helix units! With that being said, I would stay away from the Helix 7 with SI and DI together. The reason I am saying that is because the DI on the combo unit is NOT a true DI. (As rnvinc states it...HELIX 7 MEGA DI/SI does not have a dedicated DI piezo ... HELIX 5 DI does ...)
This is not really an issue for me b/c I bought it mainly for the SI and I also have a Helix 5 that has a great DI so as I said, it works for me. Now I have a buddy that just bought the Helix 7 but with DI only, which is a good unit. But as the others have told me, go as big as you can afford, you won't regret it. Hope this helps some.
Dwyane
The only place where success comes before work is in the dictionary!
SMILE- A curve that can set a lot of things straight!