You'll lose the power in having the larger tires, but as stated above, your power loss will likely be very minimal. And if it's too noticeable for ya, you can always install a clutch kit for cheap.
As for the 14" wheels, those improve handling as you have less sidewall to buckle over when you turn. However, you may compromise a tad on the supple ride. It's the same concept with these trucks that have 20" wheels with low profile tires on it. They handle better because there is less rolling of the tire's sidewall due to the reduced height of the sidewall. HOwever, it's that same sidewall that gives (along with your shocks) when you hit a bump or object, which in turn is what gives you your cushioning.
In short, I'd say the 14" wheels would be a fine alternative, as we aren't driving Lincoln Towncars down the road for a nice and quiet Sunday ride. We're taking these things in the woods and off camber. That's a decent trade off IMO for better handling.
