I would consider either a Billion 8800NL, or a Zyxel 8324 bridged into an Asus. I personally use a Zyxel 8924, as their firmware updates are better, but the Billion is just as stable. Both can run stats, and work fine with Asus, I run mine into an AC-66U and an AC-68U Access Point. The Huawei modem tends to sync at a lower speed than the two aforementioned routers.
Setting up bridging is simple with both the Billion and Zyxel.
I am a big fan of Asus routers, so would suggest sticking to the router you know, but use the Merlin firmware!
I should add that I am on VDSL, BT Infinity so my cpmments above would not necessarily apply to other connections. Again I should say that the new Type B HomeHub 5 (avoid the Type A) is an excellent router with good wifi and the same modem chipset as the Zyxel, and the Billion, and in my experience syncs at the same speeds, so it may be worth giving it a try before you shell out on a two box solution. Of course you will be in the dark stats wise if you do, as the HH5 gives up very little!!