[Niggel]

I would say at least half pot-size. With the pot beeing t2400 and ~t4300 behind I like something like ~t1500. It commits you and you have to put your rest in whatever the river may be, but betting 600 into a pot of 2400 is just not enough.
If your opponent is really Laggy I like your bet a bit more, because this one fourth Pot-Size bet induces a Raise/Push quite often. In general I would bet more just 4 value. You will be called by a lot of hands (A [img]/images/graemlins/heart.gif[/img] x 4 sure) and that makes a big bet +EV imo.

Edit: I know this is not the question but I wouldn't recommend min-raising J3s as the SB against most players.