Question....best internet for lots of video chat...will comcast solve my ATT problems

long story short, I have a long distance girlfriend, and before the obligatory you've got to bang other chicks mentions.....yes she's worth it she is doing her MBA at Wharton, anyways I have alot of family overseas as well so Im always skyping.

Currently I have U-verse max plus I believe $130 a month on special right now 450 channels U-450 package plus 18 mbps download.....not sure the upload, anyways recently the internet is always messing up. Im always having to unplug the modem and replug it before I can log in to my PS3 or before I skype bc it lags alot. Surfing the internet is fine, but PS network and skype is awful....anyways Im using an Imac 27, also I just got an ethernet and plugged it to the modem. ATT says there are too many devices on my network, they count 6 somehow, I guess that's Iphone plus Imac, plus laptop,plus ipad, not sure what else. Anyways Im contemplating the switch to Comcast Extreme 50, 50 mbps + their biggest cable package and its $163/month.....will the extreme 50 solve my issues? Is it worth the hassle and switch plus $84 installation?

For the record I live in a high rise on the 23rd floor, does this have any bearing on my situation? Thanks.....sick of calling ATT, 3 calls in past 24 hrs, all re-routed overseas to be told that I'm getting 12 mbps which is good....ummm no its not when Im paying for 18 mbps thanks cousin in India

 

thanks rokkit, i knwo 50 mbps is overkill really and more business internet but it seems like my only solution right now and I can deduct it anyways on my taxes so the fee increase isn't the end all, I just want the unplugging and restarting the modem everytime I wanna use my PS3 and the skype lag to just stop!!!! it drives me nuts, and ATT claims I have alot of devices on at once which makes no sense bc my ipad and laptop are off and only Imac and iphone are one and only the Imac is in use at the time! Comcast says it doesn't matter how many devices I have, I don't know Im losing my mind dealing with customer service reps in bangladesh

 

but when I stream video isn't that upload??? I do the speed test and upload is only like 1.2 mbps....comcast extreme 50 I believe offers 6 mbps?