Apart from the general guidelines above, I don't recommend any particular brand or model of regulator over any other. I have used many different regulators that all worked well enough. I don't think it matters. Just remember - you get what you pay for.
With regard to octopuses: if you are on a budget, buy a better ( ie: sealed first stage ) regulator without an octopus, rather than a cheaper one with it. A same-source octopus typically adds $50-$100 to the initial cost of a regulator, plus $15-$25 annually for "service", and is completely useless. Should you later need true redundancy for local diving, do it right and get a pony bottle and second complete regulator.
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