Welcome to AA, and greetings from a fellow Metro Richmonder!
The thing about guppies is that if you do decide to introduce females, you would need 3-4 (at least) per male because the males will pester the females endlessly, and create a very stressful situation. That would mean you would have a less colorful tank, with only a few males and many females. Then you get babies, and an overstocked tank, in just about no time 8O
I am no guppy expert, but maybe someone will chime in about males together. I certainly see them in the LFS
all together, so maybe it can work. I have pondered this very issue myself because I really love the colors of the males.