If you still have the reg edition wrapped... return it and get the CE, for $60, worth it... Well, chances are, you have not play it yet, you will not play it soon...
Well, it cost $60 when i first bought it from Amazon anyway, so come to think of it, it's the same deal. $10 GC (applied instantly, the promo was for reg edition, but got adjusted to the CE) and $10 from BML...
If this CE is steelbook, then i'll say, it's worth it, otherwise, $60-$70. The game is cool though, you gotta play! For some reason, i like the first one better.... The 2nd one plays more like Resident Evil.