I would seriously look in to getting a hand,wrist finger elastic exerciser wheel . http://www.allegromedical.com/exercise-fitness-c523/power-web-jr-7-p210916.html  Take it from me i have had two carpel tunnel releases on my mouse hand . I use this "Web wheel " faithfully it helps relieve wrist/hand tendon pain. My wife purchased a Intous 4 when they first came out it is a major help at times , the only complaint is it takes up way to much realestate on the desk top  i had to devise a separate mobile cart to hold this giant of a tablet ,you will find allot more arm movement just by navigating from side to side on this giant tablet , Personally i would go for a mid range size if i had to take it back . 

Take care of that wrist ,Michael