[Cleverbeans]

I think a strong bet on the river looks good. A smaller bet would look like a suck bet and might arouse suspicion, but a larger bet might make him think you're representing the flush. I'd probably bet around 4k, so that the decision is tough assuming he has any sort of hand and it looks like you're leaving some chips behind in case he comes over the top on you. If he's got a decent hand you've got a good shot of getting called, and if he think you're bluffing he might reraise for more value.