jacatone - not sure which blind is "the best," but here are the three I use -
1. Windows Vista by 6205
2. Ultimate Aero by Rockuall
3. AeroGlassV5 by Ironjar
All three have a XP start menu (i.e. no non-functional search line at the bottom of the start menu). Windows Vista and Ultimate Aero are very similar. I like Windows Vista's shutdown box better, otherwise hard to tell the difference. AeroGlassV5 has a different start menu than the other two blinds (the user icon is blended into the menu rather than sitting on top of it). AeroGlassV5 also gives you different menu colors and styles to chose from. You can make some inetersting looks with all three blinds by using WB 6's transparency function and chosing a wallpaper to blend with the start menu menu and taskbar.
The place to get Vista and Mac themes is Deviant Art. New ones go up there every few days. Lots to chose from.
Ultimate Aero link:
WWW LinkI don't recall where I got Windows Vista and AeroGlassV5 from. A search at Deviant Art didn't show anything. Try a Google search.
Let me know if this is what you're looking for.
Good luck,
Sleep