River play with 3rd best FH

[pstripling]

This hand came up in a PLO H/L 25.00 game on PartyPoker. Let me start by saying that I am just beginning to play PLO H/L (I am normally a Limit Hold Em player, although I have had success at limit Omaha H/L as well) The following hand came up and I want to know what the best play on the river would have been. BB is unknown and CO is a decent player.

PLO H/L 25 PartyPoker
Hero MP2 (25.63)
CO (43.00)
BB (31.00)

Folded to Hero calls BB (A [img]/images/graemlins/club.gif[/img] 5 [img]/images/graemlins/club.gif[/img] 3 [img]/images/graemlins/heart.gif[/img] 4 [img]/images/graemlins/heart.gif[/img]) , Folded to CO who calls, everyone else folds BB checks

3 Players pot = .95
FLOP: A [img]/images/graemlins/diamond.gif[/img] 3 [img]/images/graemlins/diamond.gif[/img] 7 [img]/images/graemlins/club.gif[/img]

BB bets .95, Hero raises 1.90, CO calls, BB calls

3 Players Pot = 6.65
TURN: J [img]/images/graemlins/heart.gif[/img]

BB Checks, Hero Checks, CO bets 2.00, BB calls, Hero Calls

3 Players Pot=12.65
RIVER: A [img]/images/graemlins/heart.gif[/img]

BB Checks, Hero bets???

Comments welcome on all streets. Having made the 3rd best full house I want to bet a reasonable amount, yet be able to get away from it if faced with a large raise and a call.