The Delica and the Endura are two of the all time best sellers so they would be a good start. You could probably find the Endura used for less on E-bay. The Delica 4 is much better than the Delica 3 but the Endura 4 is not that much better than the Endura 3. That is just my opinion but I would get a PE Delica 4 and a combo edge Endura. Combo edges don't get any arespect but in a larger knife like the Endura, they are great. In a small knife, they don't make any sense.
Actually if it were me, I would get the new Caylpso 3 when it comes out in a few months and then see if you need another to fill another niche. That Calypso 3 is going to make a great Delica beater. It will cost more but it will be worth it.