'All in one' modem/router (for ADSL & VDSL) or HG612 & router?

[InQ]

Currently have ADSL2+ (via XILO LLU (TalkTalk reseller)) with a Netgear DG834GT router, its only a 'G' capable router and it can get flaky at times (my phone sometimes hangs 'obtaining IP address' even though the phone IP is reserved a specific IP for exmple, also with the kids and wife the number of wifi devices is approaching 10 and can be in use all at once).

Fibre is imminent (31/12/14, cab has been in since August) so its got me wondering about VDSL modem router options (all in ones) or seperate modem and routers. Not sure which ISP yet (either BT, XILO or Zen probably) but HH5 doesnt fill me with confidence for example.

The Asus DSL-AC68U 'all in one' seemed ok but the reviews and feedback on stability on this very forum arent great.
The Billion 8800NL looks ok and cheap but only 2.4GHz N and wifi coverage is not meant to be too hot.

Anything else to consider?

OR

Do i go seperate Huawei HG612 (Openreach modem) unlocked for stats and normal router? (eg Asus RT-AC68U or Netgear R7000 Nighthawk)
Would this be easy to setup?
I could use my current DG834GT as modem only for ADSL until VDSL is fitted (apparently set the DG834GT to modem only, then in the router i'm using pick PPPoE and input the ISP details?).

However I did read the HG612 can connect to ADSL, anyone doing this?

 

[InQ]

Thanks.
So does the router take the default ip address (say 192.168.1.1) and then allocate the modem an ip say 192.168.1.2 from its DHCP server?

 

[InQ]

OK might leave it a bit, firmware update(s) might make the DSL-AC68U more stable from a fibre modem point of view.

Looking into the HG612 for ADSL and i cant say i've found many people using it with ADSL with any real success. Likewise my DG834GT (with DGTeam firmware) in 'modem only' mode seems a bit hit and miss.

PS the DSL-AC68U can connect to ADSL as well on its own?

 

[InQ]

Could I use my DG834GT as is (ip set as 192.168.1.1) but switch off its DHCP server, connect a wireless router eg RT-AC68U, give it an ip address of 192.168.1.2 and enable it's DHCP server (use range 192.168.1.3 upwards). Would this work ok?

Edit
Also I could switch off its wireless side as well.

 

[InQ]

Yea i kinda read about the modem only option but seemed to be a bit hit and miss, maybe I'm wrong and reading only negative things (positive stuff doesn't tend to get posted!). Guess I won't know until I buy a router and try it.

 

[InQ]

Well my RT-AC68U has arrived, time to have a play and see if i can get the DG834GT to act as a modem only.