Late, but the problem with that is you'll pass Perish Song too, which... I don't think you want. Another issue is that bugs can be strong, or they can be sneaky, but never both, except MAYBE in the case of Volbeat. It does look interesting though, nonetheless. As for Energy Ball v. HP Ice, with a monotype team you wanna be able to take out your weaknesses; Energy Ball won't do that as well as HP Ice will. You've already covered the biggest point though:
[quote]once you lose the element of surprise, that's it, really. [/quote]
It's the same with the Absol lead I use sometimes in that it's unexpected and can catch a lot of people off guard, but if it's expected, it'll probably get played around very easily. A shame, really.