Isp

Hello i just built my new rig in February and I have noticed that i am bogging down my network at home with 3 other laptops on it. I am with comcast with a 1.5-2 mbps deal and am going to upgrade but i don't know what i should get i am looking at :

Xfinity Double play digital preferred for $80.00 for 12 months and 100 for months 13-24 sign 2 year contract with internet of 20mbps right now i have basic cable willing to upgrade to better but just a feature in sorts

Xfinity 20 mbps: 30 for 6 months (promotion)
30: 73 a month

Verizon fios double play: 80 cable and internet 15 download, 5 upload

Verizon fios internet: 15/5:?
25/25:?
they don't display just internet prices but triple bundle prices

any you can think of that is fast.