Upgrading Wifi-card in T420s ... will an Intel 6300 work? Other recommendations? Modded BIOS?

Question

Hi all,
My trusty T420s (4172-CTO) has been rock solid for years but recently has started having issues with wifi disconnects. I've tried multiple wifi drivers, flashing my router firmware, even a new router. Nothing has helped. I am left with the conclusion that my card (Intel 6250) has got to go.
I am familiar with the whitelisting issue, but was wondering if there was a card I could use instead that would work without a bios mod. I checked the HMM and saw that the Intel Centrino Ultimate-N 6300, FRU 60Y3233, is listed for my application. I can get one on ebay fairly cheap. But, I see the 6300 has three antennas, not two like my 6250. Does this mean it won't work in my T420s? Would I just leave one of them disconnected? Which one?
Is there another card, already whitelisted, that would work?
Failing this option, I will go with another card (Intel 7260 unless somone has a better idea) and a modded BIOS. I have found a couple of forums and threads that walk through the process (and provide the BIOSes) but if someone has a recommendation for a site/service to use, I'd appreciate a heads up via PM as I can see such discussion isn't likely weclcome publicly.
Thanks, all.
-kj-
T440p | Core i7 4700MQ @ 2.4 ghz | 8 GB | Samsung 840 EVO 240gb SSD | 14" | Intel HD Graphics | Windows 7 Pro 64-bit
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Answer 1

Thanks for the reply. What do you mean "2.4 GHz WiFi reliability is a hit or miss"?
Warranty is over so no problem there.
I see a lot of 7260 cards, is there one in specific I need? Example:
http://goo.gl/PKcRIU
http://goo.gl/ooaUEw
N would actually be fine, don't really need AC, recently upgraded my router and don't feel compelled to change...the price difference is small, and I'm all for future-proofing, but, I just need the thing to WORK.
Thanks again.
-kj-
T440p | Core i7 4700MQ @ 2.4 ghz | 8 GB | Samsung 840 EVO 240gb SSD | 14" | Intel HD Graphics | Windows 7 Pro 64-bit