In need of better router/modem combo

My dad arbitrarily picked-up a router/modem combo at Brands Mart awhile back in order to free up some space the router and modem had created. Plus our router and modem were getting obsolete with about 8 years on both.
He happened to pick up the Netgear N150 Wireless ADSL2+ Modem Router.
It sucks.period. Connection drops frequently and the range is horrible. I plan on buying a new one for the family as my present to the home. I've looked into a couple and was wondering if I could get some feedback on which one to go with. Some background info:
average/big house 2 stories
max of 4 users
-3wireless users(multiple streaming, perhaps one occasional gamer)
-1 directly plugged in (probably just surfing and streaming)
-ATT DSL Extreme

Now I did some of my own research and found these combos.
- Netgear N300 Wireless Dual Band ADSL2+ Modem Router DGND3300
- Netgear N300 Wireless ADSL2+Modem Router DGN2200
-Netgear Wireless-N 300 Modem Router and USB Adapter Kit DGNB2100
- Netgear N300 Wireless Gigabit ADSL2+ Modem Router DGN3500
-Linksys X200
-Belkin play N600

Any suggestions, advice, comments ,recommendations are much appreciated.

 

If you need a combo I would suggest a Netgear DGND3700.
It might be quite expensive though.