I really want to get an MSR Windburner! Amazon had them for $102 for a while, really kicking myself I didn't jump on it. Now they're back to $150 again.

Personally I really like the nesting cups. I know; ounces make pounds and it adds up. But with an extra cup (especially a 25oz nesting cup with a lid- I'm specifically thinking of the DZO mug) you can cook, boil or move more water or even make charred material! To me a nesting cup on each bottle is worth the extra pound or so of weight.
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“I'd rather have questions that cannot be answered than answers that can't be questioned.” —Richard Feynman