Have you checked out the Decathlon Btwin Kemmel, you probably need a med size. It lacks the multiple chainwheels and has only 7 gears but the rest of the bike is good quality. Decathlon seem to be the best for quality budget bikes. Check out this guide.
Gripshifters are more complex than thumbshifters, more difficult to replace the cable and more parts to break. They seem to be standard on most entry level bikes so if thats what you have, don't worry too much.This is an exception to the rule that more money buys more reliability.