eBay will give you a more accurate representation of what the card is worth, rather than opinionated guesses on here. eBay will show you what buyers are willing to pay, versus what those of us on here believe it is worth.
Looking through recent/current auctions on eBay, it could fetch you anywhere from $350-$425. I would personally hold onto it, as the value of this card has been increasing exponentially over the past couple of years. I remember about a year ago, there were only a few of these on the market, and they were selling for $600+. Right now I have seen a bunch of these PSA 10 Chars on the market (meaning a surplus), so now would probably not be the best time to sell it.
Hope this helps mate, cheers.
-Colton