How much would you ask for him?

[Lolo76]

I have an ad up (on another site) for my 4 year-old spider male, and just received an email from somebody interested in buying him. I didn't have a price listed, so what should I ask? I see adult females usually go for around $400, so I was thinking maybe $250-300? I don't want to short myself, but also don't want to look greedy.

Here's a photo of him... haven't weighed him in a while, but he's probably around 1200-1300g. Oh, and he's a proven breeder with hardly any sign of a wobble.