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Most like your existing 3750X's would be, as noted by Leo, the 3750X-24S. You can also, of course, stack them with your existing 3750X units.
Regarding whether, as Leo suggests, they are "a sure waste of money", well I guess much would also depend on your cabling plant. If your existing edge 3750X are in closets, and there's just a couple per closet, and you're just replacing floor copper, they probably are the most cost effective option.
Unfortunately, they are getting dated, and I see Cisco has recently revised the product page to suggest considering the 3850 (or 3650) series, although those don't have an all fiber model.
