Depends on your budget. Herpstat is great. Their starter is $99. I'm not familiar with Helix, but they have great ratings as well.
If you can't afford the higher end thermostats for now, then I would go with a Hydrofarm ($30 amazon). Although they do have a larger fluctuation in temperature than the herpstat/helix, which are both proportional. The hydrofarm is an on/off type.
And you don't need multiple outlets.
You can just plug a power strip into the thermostat. Then plug all of your flexwatt connections into that power strip.
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