Living by yourself, you'd probably be better off with a townhouse. Less yard to upkeep and neighbors closeby to keep an eye on things when you're not home. You can always sell and trade up to a single-family home later.
The only downside would be if you plan on throwing big parties. You've got to be a bit more careful with the noise if you're attached to the neighbors.
Generally, with townhouses, it's best to get an end-unit if you can (i.e. at the end of the row).
I'm not sure about the housing market in Denver but I know in the Tampa, FL and Washington, DC areas it's very overheated right now.
Interest rates are inching up in the US, so on the one hand you might want to lock in a mortgage soon. On the other hand higher rates might cool down the market reducing housing prices by lowering demand. As it stands, in those two markets I mentioned above, it's just starting to turn back into a buyers market but not quite there yet.