choosing a router

[civvver]

Can't decide between these two combos, or whether to just get the arris modem with a free router from promo code.

Linksys WRT1200AC Wireless AC1200 + arris surfboard

http://www.newegg.com/Product/Combo..._-EMC-091515-Index-_-Combo-_-Combo2495521-S0D


TP-LINK Archer C7 Wireless AC1750 + tp-link modem

http://www.newegg.com/Product/Combo...MC-091715-Index-_-Combo-_-Combo2502015-S2A10B


TP-LINK TL-WR841N, this one is free with same surfboard modem as 1st combo

http://www.newegg.com/Product/Product.aspx?Item=N82E16833704039


I trust the first combo brands most but the c7 has great reviews too, but then again I don't have any wireless AC band devices, only N, so maybe all I need is the freebie one for now. I need to cover a 2 story house though so I need range.