You can't go wrong with Sanwa or Futaba. It is all just personal preference. That being said I got pretty good sized meat mitts myself and the Sanwa feels fine to me but your on the right path by checking them out first and see which one "fits" you better. I'm pretty sure all the Sanwas and...
A good radio can make a big difference compared to crappy little stock radios plus they have LOADS of extra features and tunability you dont get with stock radios. I would look at something in the middle or high class categories from Sanwa. Link HERE. I have one of their middle class models...