I currently weigh 155, i want to get up to around 170-180 lbs. I lift hard and am trying to make strengh gains all over the place which i have been doin. My question is though im getting bigger and stronger but what about my speed. Im the fastest player on the team and how will my speed be affected by gaining this extra 15-25 lbs.
Adding a lot of bulk can definitely decrease speed. Continuing agility training like plyometrics, sprints and such will help you to keep up speed and agility. You just have to be very conscious about how the extra mass is affecting you. If your mass starts to compromise your speed, you need to either maintain your weight while working more on agility training so your body can adapt to the new size, or stop trying to gain altogether if it becomes a choice of size *or* speed - and eventually it will. Honestly, I dont think 15 pounds will have too much of an effect, but only you can really gauge that.
Keep your body lean, your blood clean and your mind sharp. -Rollins