In general, milder cigars will have lower nicotine levels than strong ones. Diominican cigars are typically weaker than say, Nicaraguans. So, I would stick to blends labelled as mild to medium bodied by the retailer. Focus on Dominican fillers and Conn wrappers since they tend to be mild (but not awlays---some Domincan cigars are strong). Maduros are stronger, but I'm not sure if they would have more Nicotine. So a few mild brands that probably wont make you light headed (and usually have natural wrappers) would be:
5 Vegas gold
Romeo Y Julieta
These are just a few...
you would want to stay away from (if you don't want a buzz):
Any cigar with Ligero or Corojo filler
Brands like Tatuaje, Comacho, La Flor Domincana, Padilla