Even though I throw Storm and Roto Grip for the most part, I have been venturing into Motiv lately. Most times, I usually would start with something that is midrange when getting back into the game.
2 balls that I recently purchased but have really impressed me are the Motiv Covert Revolt (medium-heavy) and then the Motiv Sigma Sting (medium oil). The Covert Revolt basically gives me something that is a little stronger, can handle some higher volumes of oil, yet is very predictable by giving a smooth, arc reaction. With not many games on it, I can already say that it will probably be the 1st ball out of my bag most nights as the place I bowl at tends to have a little more volume on the fresh.
The Motiv Sigma Sting is a great benchmark ball and one that will tell me if I should ball up, stay with it, or ball down. The Sigma Sting is clean through the front, reads the middle of the lane well, and is a little more angular on the backend. The thing I noticed with it is that for a benchmark, it tends to be much smoother than some pearl balls that are out there. That is a huge plus.
If you were to go Storm or Roto Grip, I would lean more towards the IQ Tour Fusion or the Asylum (both hybrids). Both brands make some great hybrids that can be used as benchmark balls yet handle some oil.
All honesty, all of the brands today make great equipment. Personally, I like what Storm and Roto Grip have done for a long time. However, Seismic and Motiv are also putting out great balls that can be very versatile. You won't go wrong either way.
As for a pro shop, word of mouth is good. However, a few key things to look for with a good shop.
1) If they don't take you out on the lanes to watch you throw a few shots, go somewhere else.
2) Good shops will spend time to fit you properly.
3) Good shops will also provide recommendations for your specific game based on how you bowl. If they don't take you on the lanes, go somewhere else.
Any shop can sell the highest priced hook monster out there. The big question is do you really need it when a midrange ball will meet your needs better? A quality shop will take the time to match equipment and layouts for your specific game and needs.