If you get enough orchids of varying types, you'll usually have at least one or two blooming at any given time
![Wink](http://www.orchidboard.com/community/images/smilies/icon_wink.gif)
hehe
Sequential bloomers (some Phals, some Paphs most notably), and plants that hold blooms a long time (some Phals, Cyms, some types of Dens - I know that Dens from the Latouria section hold blooms 3-4 months, there are others as well), are also helpful to ensure always having SOMETHING blooming
Some can bloom multiple times a year when a bit older (mini and compact Catt hybrids, some Vanda alliance hybrids, some Oncidiums and Oncidium alliance hybrids)
Has worked for me, anyway - I don't have a particular focus on any specific type of orchid, so have a variety. Have gotten what I like that I think I can grow with my conditions, and usually have at least one or two blooming at any given time.