If increasing your strength is your goal take longer rest intervals between sets.
Rest intervals of at least three to five minutes between sets produce the greatest increases in upper- and lower-body strength. (Journal Science Medicine, Sport 13: 429-433, 2010)
My take- This is a reminder that strength training and muscle building can be very different. If you are training to lift heavier weight and are training to muscular failure then extend your breaks to 3+ minutes. If your goal is to improve muscularity rest intervals between 30-90 seconds will work better. Weight training to stay lean? Keep your heart rate elevated and burn more calories with rest periods of 30 seconds.