My network behaves like this:

来自 192.168.1.1 的回复: 字节=32 时间=3ms TTL=255
来自 192.168.1.1 的回复: 字节=32 时间=3ms TTL=255
来自 192.168.1.1 的回复: 字节=32 时间=267ms TTL=255
来自 192.168.1.1 的回复: 字节=32 时间=4ms TTL=255
来自 192.168.1.1 的回复: 字节=32 时间=3ms TTL=255

The occasional hiccup happens to about to 3% of the packets. Sure annoys me when playing twitch shooters.The packet loss is moderate at 0.15%.

I wonder is this caused by interference? Does going 5GHz help?

wireless usually eats 0-2ms depending on your system, however this isn't really the problem with wireless. What is the problem i wshat you just listed there, packet loss. Who is a more bigger problem generaly for gaming then higher ping as it cause uneaven ping and most games cannot compensate for that.

as for 5Ghz is worse as long as there ain't many routers within your area. That said if there is multiple 5Ghz routers as well it won't help what so ever.

So yeah if there is many tons of non 5Ghz routers in your area, a 5Ghz router will help you as it will cauase much less interference.

From my previous job @ a wireless isp, looks like a tiny bit of interference. N can work well if you are using more then one stream (mimo)

Also excessive buffering (hardware wise) is another cause.

Thanks for the help, I tried other channels and found some correlation between channel settings and link performance. But since none gave me satisfactory results, I'm not going to bother testing these statistically. 300M actually gave me worse results, I guess either my laptop or my router has ill-configured antennas or my router is flat out sh*t (Meant to buy Netgear WNR2000 but bought JWNR2000 by mistake).

Too bad my card is 1000BGN and no 5GHz is available so I'm forgetting this.

spoilerLast, JWNR2000 is crap. the sustained transfer rate at 300M mode is ~3MB/s even without encryption (tested against two intel cards). The link dies sometimes and need to be reestablished (no restart needed though). And recently it begin to give me another funny problem: it won't let me login. Resetting does permit me one access, and if I ever logout, I can't log in again. This crap is not available in america at all, smart decision huh, seems netgear cared about its reputation after all.

Do any of you know some good 802.11n router models? I'm getting tired of this buying-one-crap-after-another already.

I only had experience with mikrotik

I assume you've tried updating the firmware on the router?

add "/l 5000" without quotes if using windows.
like : ping 192.168.1.1 /t /l 5000

try ping your gateway (router from your computer), if less than 1ms :

try ping your ispgateway (i recomend from router not from your computer) (if you dont know search your ip via google "what is my ip").
if more than 10ms then the problem is your router, possible : rain, snow, twister, mountain/ building, toooooo far from gateway. solution : you need good router + antenna/booster and or standing before your isp antenna (if you got dizzy then your isp is good) to connect.

now ping local site. like yahoo.co.uk
if less 32ms its good, you can play local online game.

now ping out site. like yahoo.co.jp
if less 300ms its good. some/many isp has poor international backbone.

updating firmware, high risk. unsuccessful means die.