I like her charecter and I'd take her powers anyday it just seems kind of odd when you compare it to other awesome powers like time-travel, electricity, etc.
But I do like how they're keeping the powers grounded to reality...thats what makes Heroes different from the X-men.
As far as most plausible powers...that belongs to Charlie. Actually, its not really a 'power'...more like savantism, hehe.
And the new girl (from the graphic novels) Donna Dunlap...she has super vision (like Dale had super hearing) but Im not too fond of her charecter.
Btw, did anyone read the one with Julien Dumot (cloning ability)...I always thought that cloning was a lame power but they made the cloning look very grotesque and cool.