Derek
I think you'll find the lp1 a similar weight and ballance to your Walther, the gun for you is the Steyr LP2 compact, light, superb trigger and great ballance. Half our club uses them, that's the old farts and the youngsters, and we have a current senior national team member and ex Britisish champion who uses one. They do come up from time to time, I'll let you know if I see one for sale. I have not shot pistol for two years as I have an arm problem, I returned to the dark side, rifle, to keep shooting!
I've loaned my LP2 compact to a youngster but I would never sell it.
Good shooting