I'd probably buy this just for the gorgeous bottle alone (it would make the perfect accoutrement for my vanity table!), but the excellent quality and rich, saturated color are what make YSL's La Laque in Ultra Orange my new favorite nail polish. It's a limited edition shade for summer, so make haste for the nearest YSL counter before they're all gone.
Don't be intimidated by its intensity -- it's surprisingly flattering and works with most skin tones (it pops like neon on darker complexions and looks beautifully dramatic on the fairest of the fair). If you like the look but don't want to go that orange, I'd suggest a punchy coral as a compromise. Essie's Flirt, is an old favorite, and won't set you back 20 bones.
YSL La Lacque in # 142 - Ultra Orange, $20.