Power to weight:
97-99 2.5L: 2822/201 = 14.0 lbs/hp (85.5mm bore x 72mm stroke for a slightly over-square layout)
2000 2.7L: 2778/217 = 12.8 lbs/hp (same bore as 2.5L but increased stroke by 6mm to reach 2.7L)
2000 3.2L: 2855/250 = 11.4 lbs/hp (same stroke as 2.7L but increase bore by 7.5mm to reach 3.2L)
There seem to be many different weights floating around the web. I got the weight & power from Excellence Magazine (manual transmission) and as you can see, the 2000 Boxster's were lighter overall than the 97-99 models (at least that is what this reference says):
Boxster Specifications