Alan,
If I were in your position, but knowing what I know now about both SXSs and shooting this is what Id do.
1. For a target gun Id choose a 12 gauge SXS that weighed about 7.5 to 8 lbs. A 12 is nice because you have an almost unlimited selection of ammo and when ammo goes on sale you can always find 12 gauge. A lighter gun will give you a harder felt recoil.
2. If recoil is a worry start out with light target loads, for my sons wife I suggested she begin using 12 gauge Winchester AA Low recoil/Low noise shells or Xtra-Lites. I believe all the major manufacturers have equivalent shells. BTW, I think most people on the board will agree with me, hi-power, hi-velocity shells are not necessarily the way to go, unless you like blown patterns.
3. English grip or pistol grip, thats a personal preference issue and since Im not a mind-reader youll have to figure that one out on your own.
4. Take the two guns you currently own, choose the one you shoot the best and measure the stock dimensions or have them measured. Try to find a gun that has those same measurements or can be easily adjusted (for instance, add a recoil pad to increase length of pull). Better yet, find someone to take your shooting measurements and use those measurements when choosing a gun. Gun fit will make a big difference in how well you shoot a particular shotgun, so its money and aggravation saved in the long run.
Ill let others here recommend what model to buy.
I hope this information is useful.
Steve
PS Welcome to the board!
