+1 for Shift-Tech... Everything I have seen from them and have bought personally has been fantastic for quality and fit. Also, with the Forum discounts available, it is also decently priced compared to the competition.
Although Bestem products are less expensive for their CF/FG mix product (Of which only you would know once it is installed), some of their products are also 100% CF... They are good at labeling what is what when you are looking to buy.
The one downside that I found with Bestem is that they do not offer nearly as much for the Panigale compared to ShiftTech. Guido has nearly ever piece imaginable for the Pani available, wheras I found Bestem has mostly the "popular" stuff that everyone else offers too.
In the end, they are both great brands and you would be happy with either purchase... I personally would support the Forum Vendor first.