As neverdie says, go with the one(s) you like, but I would also add:
- go with the price you can afford
- go with the one(s) that will serve your needs best
Comparing Them:
- The delica and centofante are a bit shorter on blade length than the PM2, I believe they're 2.875"/3.123"/3.44" respectively. Delica and Cento are a bit lighter as well
- deli/cento are both VG-10 vs the S30V of the standard PM2 in your price range, in case you have any steel preference
- Handles are FRN on Deli/Cento, G10 on PM2. IMHO, they're both great materials
- Deli and PM2 offer 4-way clip orientation, while cento only offers tip up/down on one side
- Deli/Cento have backlocks vs the compression lock of the PM2
- Deli/Cento have pinned construction vs PM2 torx screws
Hope this helps, and if I messed up any of the data, I'm sure someone will let me know.

For what it is worth, once you buy one, it is usually only a matter of time before you end up buying the rest.
