It will probably be about the same price either way you do it. I'd go ahead and get your 4 way manifold right off the bat. For now you can just run them all off a single regulator, but in the future you might want single regulators off of each line so you can have separate pressure settings for each tap.
A 5 lb tank will suffice, but if you have the means you might want to consider just stepping up to a 10 or 20. It will just mean more time between having to refill.
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Fermenting/Conditioning:
Cecile's Secret IPA
Midnight Blackout Dark IPA
On-Tap:
Highland Oatmeal Porter Clone
Jungle Love APA
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