All depends on what you need from your op. CFL produces very different, lower intensity light than HPS and produces different plant growth characteristics.
If you need low heat output, don't need a lot of buds and can sacrifice bud density, CFLs are suitable for your flowering op.
If you gotta have a greater quantity of buds per crop with much more solid density, HPS is your choice.
Small HPS lights, in the 60-75-100-150W area should be given serious consideration for flowering in micro ops. No, you can't get them at the grocery store... but they are available in most bigger hardware stores as security lighting.