all prices lowest at larger On-Line discount stores beginning of August 2013, so actual purchase would be slightly higher :

ipTime N8004R introduced December 2011 W65,000
RealTek RTL8198 chip – 4-port GigaBit LAN – wireless 802.11b 802.11g 802.11n 300Mbps – dual band 2.4 & 5GHz – 4 antenna reception 4dBi – 64M memory – control from smart-phone app  – VPN WDS WPS

ipTime N7004ns introduced June 2013 W65,000
(2013.1.7 Ralink merged with) MediaTek RT6856F chip – 4-port GigaBit LAN – wireless 802.11b 802.11g 802.11n 450Mbps – dual band 2.4 & 5GHz – 3 antenna reception 4dBi – 64M memory – control from smart-phone app – ftp file server – VPN WDS with WPS button

ipTime A2004ns introduced June 2013 W 72,000
RealTek RTL8197D chip – 4-port GigaBit LAN – wireless 802.11g 802.11n 802.11ac 867Mbps – dual band 2.4 & 5GHz – 4 antenna reception 4dBi – 64M memory – control from smart-phone app – smart-phone chargeable & file-sharing USB port, ftp file server – VPN WDS with WPS button

have listed above the THREE most powerful (number of antenna is the give-away) wireless routers, from ipTime’s line-up early Summer 2013 for specification comparison . I should note one welcome add-on, concerning manufacturers revealing actual chip used : it didn’t used to be so, but their own effort from 2012 to sell later models as an improvement of the older .  to-date : ipTime notes the earlier N8004R is still the reigning model in terms of power and far-reaching extent, while the later 2 new models have added NAS capability, with A2004ns : 802.11ac on top of that . and as I have found out to be true too .
DSC_3008lev800AlgPAT

DSC_3013lev800AlgPATDSC_3001lev1kMonPATDSC_3002lev800AlgPATDSC_3004_1kMonPAT
note a big selling-point accentuated by its manufacturer is A2004ns’ larger electric adapter, to power potentially connected USB disk .

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although the three top-of-the-line models introduced here, whose 3~4 antennas will cover quite a large open-space office, a medium-family apartment is the maximum for domestic residences . as listed on our wireless speed page : numbers drop suddenly after entering the third room then door closed .

Korea Tech BLog is updating ALL wireless speed review test on a /single/ page on top menu, so will be there eventually . but for now, the old experience still hold true from the days of business trips on the belated Korean bullet train KTX between the Capital of SEOUL and the Port city of Busan or Pusan, which run diagonally almost to the full length of the Southern Peninsula – it was the time of (technical) stone-age modem-speed with USB-sized dongles attached to your laptop or notebook – the older model is more stable with slightly longer reach, as the new shows irregular drop-outs while a tad faster . so unless you absolutely NEED NAS which I currently note on ipTime’s ipDisk Page on top menu : again quite um, no actually notoriously unstable, no need to upgrade just yet ~

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– when the Annual rainy Monsoon Season ends in time for massive Summer vacation migration, 2013 Korea Tech BLog –