Order posts by "best answer"

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Ahm, I didn't explain my idea properly. My main target is to have a filter that sorts posts by MySupport's best answer feature. I need XThreads and Pluginlibrary to style, for example, first post and best answer post, I know I don't need them to achieve the filtering feature (well, XThreads has a filtering system, but it's applied to forumdisplay if I'm not mistaken... I need it for showthread instead).

Gently, can you tell me if it's possible and how can I achieve this? Thank you ZiNgA BuRgA and sorry for my english, I'm italian and I can't speak it perfectly.