Should I be OK with UHP or should I go for HP? Is that a big difference on either for the look I want. (photo)

Choosing the right implant is a very important decision. How to choose between two choices that you have presented is really a matter of whether you want more outer fullness on the sides of your breast or more projection. The ultra high profile will give you less outer fullness and a lmore of a projected look. If you're worried about having too much projection you can also go for a slightly smaller volume and still use the ultra high profile. If you don't mind a little more outer fullness then you may want to consider the high-profile implants.  If if you are not sure, then visit again with your plastic surgeon so they can go through the differences in more detail.

The best implant profile for each patient depends on careful measurements and an in-person consultation.  As a general rule, remember that the higher profile implants are also narrower and mean your breasts will be farther apart if the implant is properly seated beneath the breast and nipple.  In women with a very narrow rib cage (like 28 inches), I find the higher profile implants very useful. 

Either implant should give you a really nice result. You have a good breast shape to start with and will likely be happy with either one. The UHP I tend to shy away from personally but will use those implants to avoid a overly wide implant in someone with a narrow base diameter or chest wall. Try and find a surgeon with a large number of before and after photos to view their gallery and see what UHP look gives patients who's preoperative photos mimics your current body and go from there. Trust your surgeon assuming you chose a board certified plastic surgeon. Lately I've been using more of the Sientra high profile textured implants because they are more similar to the UHP and have been happy with the results. good luck!