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The 3 fish you mentioned should be fine with a purple tang, I'd go with a yellow eye kole over the brown tang but that's personal preference more than anything else.
Once you're ready to add the new fish I'd just make sure that the tang is well fed and add the fish after lights out. This will help mitigate any aggression, there will probably still be some when lights come back on but should only to establish a "pecking" order.
As far as the blue tang goes, I'm far from the tang police but I think those are best in at least a 6 foot tank and 200+ gallons, a 5 foot tank just isn't big enough for those beauties.
That said I have seen blue tangs in as small as 75 and 90 gallon tanks but they are usually still on the small side, it's just not something I'd do.
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