I have one that is going to be a bigger girl, too. We have nicknamed her "yorkzilla." Her growth rate was phenomenal early on, but it does seem to be slowing down recently. Here are her weights:
7 weeks: 32 oz
8 weeks: 36
9 weeks: 38
10 weeks: 50
(that's an increase of over 30% in just one week!)
11 weeks: 58
12 weeks: 72 (24% increase from previous week!)
13 weeks: 74
14 weeks: 83
15 weeks: 91
16 weeks: 97
17 weeks: 104
18 weeks: 113
19 weeks: 116 (7 lbs 4 oz)
She's really sturdy, but very skinny. If you double the 12 week weight, she'll top out at 9 lbs, but I wouldn't be surprised if she turned out larger than that.