[throwaway124219]

For me, XP is the one I prefer. It looks more "modern" than 98 but not as "glossy" as 7. It has the right balance of better looking buttons and radios, but doesn't go too far

[sitzkrieg]

xp looks with 7 taskbar drag-ability would be the sweet spot for me (reckon this ends up comparable to a tame xfce panel too)