Recommendations for a new modem router?

I'm looking for recommendations for a new modem router (which I prefer since it means only one bit of kit to accommodate) for my iMac.

It needs to be

• capable of accessing standard broadband - which I currently use in my study
• capable of accessing fibre broadband should I decide to upgrade
• very reliable connections/performance 
• very secure
• include ethernet
• includes ADSL and an integrated VDSL2 modem

I must confess it's ages since I bought one because last time I bought a very good one and it's lasted me a long time. However it's now time to upgrade (see "the background...." below for why).

Which means I have to get my head round the:

• need to know - re current context and prospects
• what's available
• what's recommended
• what works with normal broadband and fibre - just in case I upgrade the broadband in my study

I'd be very interested to hear recommendations from anybody - particularly if you've updated your set-up recently - about:

• your set-up
• which is the best brand
• which is the best modem router.

I'm also interested in any recommendations as to nifty features that are worth having.

Note: I've currently got a Zyxel P-660R-Tx v2 Series ADSL2+ Access Router which has served me very well for many years!

What my Zyxel modem router does

What's a modem router?

A modem router combines the modem and the router

• the router creates a network between devices in my home
• the modem connects the network to the internet

I prefer this because it means I only have to find space for one bit of kit rather than two.

This article explains it better - What’s the Difference Between a Modem and a Router?

My iMac has an internal modem which means it can connect via wifi to my other (fibre) broadband in another part of my home via the BT Hub - which means when my current set-up is playing up (as mine is at present) that i can still get online - as I am at present!

What's VDSL?

I need to look beyond ADSL2 which is what I've been using so far.  I found this article What’s the difference between ADSL, VDSL and fibre internet?

The background to the current situation

I think I've finally worked out the cause of my current iMac problems - it freezes - except if I disconnect my modem router and my back up hard disc.

After a mammoth session with Applecare Support last week where I did various techie things to try and clear out the source of any software problems, I ended up deciding to try and use the computer by creating a wifi link to my second broadband account - in another part of my home and disconnecting all the hardware. I then worked fine for a week!

So hardware was definitely the source of the problem- but which bit?

I got the answer this morning when having to update some credit card data which I only like doing on an ethernet connection. So I turned my Zyxel back on - and did the transactions and then started to continue as usual - at which point it froze - and I had my answer as to which bit of hardware was causing the problems

So I'm now back on my internal modem and connected to the other broadband.