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I agree with Robh, Gamma Velorum is a good challenge. We have to remember that this is also the brightest Wolf-Rayet star in the sky, its class is "W", that means just before O class (ultra-violet radiation is very intense).
Otherwise, I suggest some O or W stars belonging to OB associations:
*Orion (explecially Alnitak and Sigma Orionis);
*the Plaskett stars in Monoceros (two O-type stars in a system);
*S Monocerotis (O7, belonging to Mon OB1);
*29 Canis Majoris (O7, close to NGC 2362);
*Many stars of the Tr 14 cluster, inside to the Carina Nebula; HD 93129 (6th magn.) is O2 class.
*HD 92740, magn. 6.3, Wolf-Rayet star near Tr 14.
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