In terms of getting a better grip every Home Depot has a few higher grade receptacles. Take a cord with you and get the one you like.
There's a lot more than gripping features to consider though. Its amazing how much better music sounds through some of the higher end outlets from Synergistic Research. Ideally you would audition a few and pick the one you like. But that is kinda hard with outlets so I would just buy whatever SR outlet you like that makes sense for you and what you have in terms of power cords, conditioner, etc.
There's a lot more than gripping features to consider though. Its amazing how much better music sounds through some of the higher end outlets from Synergistic Research. Ideally you would audition a few and pick the one you like. But that is kinda hard with outlets so I would just buy whatever SR outlet you like that makes sense for you and what you have in terms of power cords, conditioner, etc.