hey thanks for replying.
i know it is gonna cost and i supposed it is going to have a carbon frame. problem is, i live in croatia and i suppose they will have to import a bike for me. they don't have many bikes at stock here if they have cervelo at all!
so i don't think i will have a chance to try many bikes. maybe if i go to germany and bring the bike to croatia myself by train and that is not the easiest option.

other thing, i know 7kg is very light and it doesn't have to be exactly that weight. i need it to be as light as it possibly can considering the purpose and the money. as for the price i think i wouldn't go higher than some 3800$. problem is, my current bike is i think around 18kg and it is quite clumsy for handling. my elevator is really small and since i find it difficult to put the bike upright i put it straight with the front wheel turned. this light one i could easily carry on the 2nd floor with me.

the other thing that i find problematic is whether i should buy a road bike. i live in town and have a city bike. i would really like to try a road bike but is it suitable for terrains other than concrete. what if you have to ride over the grass for a few hundred metres, or over the roads where there is no concrete? or if i have to jump on the roadside? can you do that with a road bike or you will end with a tire puncture? is it maybe better to consider a mountain bike then? or a hybrid?

thank you all for such a prompt replies.