Caribbeansun01 took the words right outta my mouth (wait.. I'm typing, not talking... So- fingers?? Hmmm...).
Anyway, Designer Skin carries a diverse assortment of lotions without being overwhelming. Even their 'economy' lotions are a quality product, so clients will be happy with them.
Something to think about, since you offer
Airbrush Tanning- California Tan and Norvell both offer many products that compliment Sunless Tanning (i.e. Sunless Tan Extenders, Primers, Touch-Up, etc.) Carrying those lines will bring a continuity between your Traditional and Sunless services.
Above all, don't get carried away by the hype surrounding many lotions. In a small setup, select two options at most for each type of lotion (bronzing, Hot Action, Accelerators,Cooling, etc...).