If you want to have versatility with one male you might want to consider getting male combines several traits, even if some of the traits are just het. What you get depends on your budget, and you like personally. My advice is to decide what you persoanlly like best, what you think is beautiful, and focus on/work towards that.
Some morphs are not compatible though, for example there is no sense in getting jungles or stripes and patternless together, as patternless is a recessive trait that will cover the jungle if expresessed heterozygously. However you can combine patternless with tangerine (selective bred trait) or albino (recessive trait) or both. There are three genetically different kinds of albinos- Tremper, Rainwater/Vegas, and Bell.
You could, for example, get a male patternless het albino, and a female albino het patternless. You would likely get patternless, albinos, double hets(looks normal, het for both traits) and some patternless albinos. Patternless albinos are easy to sell at the right price, and prices are still fairly high for those.
There are also Blizzards, Hypos, Melanistic, and snow leos. Look around and see what you think is beautiful, and go from there. One word of caution though, if you get into breeding, do it because you love it...don't count on making a profit. You might, you might not, and you might just break even—but if you do it because you love it, you win no matter what happens, beacuse you get to enjoy the hobby.
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Sarah Stettler aka Starling
Sarah@stargecko.com
StarGecko.Com COMING SOON! Star Quality Leopard Geckos
Specializing in Hypotangerine Tremper Albinos