We have an opportunity to upgrade our fiber network to 500/500, and later in the future to 1000/1000 speed.
I just want a very good router that last for the future upgrade, thats works greate with my stuff that you can see.
First of all, don't be fooled by WAN speed for home market. 1000/1000 could only mean the speed between your home and the ISP server (and the data centre of multiple ISP's inter-exchange). If you're lucky, you might get 1000 speed to major websites/servers in your city. Once beyond, speed drops and depends on the weakest link. Not to mention when you go overseas or cross national borders.
I'm currently using 100/100. If I pay 40% more, I could get 1000/1000. The absolute price (after 40% premium) is still cheap but I have no rush to sign up for a two-year contract for the reason I said. Also at the moment I can't even make full use of 100/100. Most of the time my WAN is idle.
In Edgerouters series, you can't easily find a router with sufficient extra headroom for 1000/1000. Moving up the line, you've to pick an Edgerouter 8-port. With the steep premium compared to ER-X, not worth it IMO. Though it will be very future proofing for your need.
If I were you, I would get the X-SFP. Don't get me wrong. My ER-X recommendation only for 500/500 is very picky. When I think it'll excel, it really flies most of the time if not all the time. I like to reserve extra headroom in equipment. For your speedtest, BT, etc, you'll get near 1000 speed with ER-X. I think SFP is good for you because I see this Sweden ISP
thread on UBNT forum. Worth a read and perhaps check with your mates there. Seems to me with X-SFP, your ISP can help you or you yourself get a SFP module to plug into the router. Then you get rid of the Technicolor gateway/modem - leaner setup.
In a year or two, I guess cavium based edgerouter will get an upgrade. Even UBNT staff admits openly on forums that the current cavium platform is too old! By the time, the "new ERL" will be better differentiated from ER-X and I'm sure the decision for an excellent 1000/1000 router with reasonable price is an easier pick.
When that moment comes, your X-SFP can be converted into a handy smart switch with POE power supply. I don't see you can go wrong down this road.
Save yourself time from looking at "high-end" Asus or Netgear. Its firmware isn't qualified for a good router IMHO.