[stokken]

With uknown players it is hard to define a range.
Standard would be as suggested above-somewhere along the line Any PP,A-(K-9), A-xs, Broadways and 1 gap suits.

It is sometimes good play to limp from co because of its deceptivness, and its good for establishing a read.
I would splitt the limp 4 ways
1.Crap hand-but set up for repping AA-KK to any raises or weakness
2. Good, but not excellent hand which is for some reason not elected to attempt a steal with or at least charge an amount to stay in for. Maybe a read, some reason?
3.Semidecent/weakish hand which is brought into play cheaply, and to keep button from stealing and accumulating.(One will face alot of though decisions against the players to immideate left and right, dont give them anything free)
4.Slowplayed AA-KK.
(Offcourse any of the above could be played as rep AA-KK slowplayed)

Things to consider: he is big stack, and could actually try a steal with anything, but has elected not to. But he wants to be inn the hand.

AJs. Against a fairly broad range as suggested and two random hands co:26% AJs:36,5% Sb:17% bb:20,5%
Against AA_KK co:50%, AJs:23,5% Sb and bb 13% each.

Pot is 75+150+150=375

To me a raise of 450-550 will not produce alot of information.What is it one whishes to acomplish with a raise? Stealing the blinds? I rather feel it will leave room for moves. Button could put on the squeese. Co could reraise and both raises are though to call. I`d rather limp and wait to see sb and bb actions, and if any raises co`s response. I want to see a flopp with this hand, but as cheap as possible. One should already be thinking far into the hand. What type of flopp do we want? If an A flopp we are left with a though decision, if a J flopps as top card we have a though decision.If there is a straight draw or flush draw( other then our suite)its a difficult decision.If it is rags its a difficult decision.
To continue with the hand we are hoping to flopp something that will be strong enough to bust AA or favour ourselves against the possible range. Which is a longshot.

The second approach is repping something big ourselves. I might choose to do so sometimes. Bring it up a good size,leaving odds of 1:1,5 to any caller-at least it leaves the message dont get tricky with me. It discourages moves from those without balls of steel, and it`s real easy to be done with the hand if anyone comes over the top.But I prefer moves like this in different situations and in later stages. Sometimes I would just fold and pay attention as there will most likely be a flopp, or some action that will leave some information about the players.

I favour call 60%, fold raise 20% each If I call or raise I`d do so without much hesitation