Yes, you are right. I'll go with 9s and check how everything goes and decide later.
Thanks for the reply. I thought about it, and the setup for £50 isn't worth it. In fact, i decided to buy from a different shop called Thomann, which have their own limited edition Tremonti SE custom with an ebony fretboard, which costs quite a lot less than the one i originally planned to purchase. It's still a 2017 model, but with an ebony fretboard, so i guess it will be just fine. If i'll decide to change the string gauge, i guess i will have to order a new nut, but the problem would be setting up everything else. I have no experience with tremolo setups and have really bad experiences with my shitty guitar, so i don't really want to mess with any setups.
Are there any modifications needed right from the start? Like tuners, nut, pickups, pots, whatever? Since i will be ordering online, i guess i should order everything i can to avoid shipping costs at later dates