If i had the moola and the incentive to uprgrade from Reason as well like you I would look into the BFD Drum Instrument:
http://www.fxpansion.com/product-bfd-main.php
Judging by what I've seen and heard the BFD instrument has the most realistic drum sounds out of all the VSt drum things I've heard. What's really cool about it is you can decide what drum heads, drum sizes, actual drums *ludwig, pearl, dw etc.. you can use and you can mix and match them plus you can pick mic placement and i believe you can also add percussion elements like claves and chimes. All in all a fabulous drum instrument package in a virtual form.
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