i have loved three garmins, but never felt the need for one with voice command. Will you be alone on the trip? If not, someone can easily enter the destination for you.
I would only buy one now with lifetime free map upgrades. The ones with lane guidance are nice also. I get the bigger screen and lifetime traffic, but the traffic isn't always really helpful.
On a business trip recently it helped me go around a wreck to get to work, but offered no warning at all to the one hour delay going back to the hotel.
Sheila