Too many to choose from, really, but if I were to choose one for outstanding value it would probably be their Tarragona Gran Reserva, variously priced from EU2.99 in Germany to a rip-off chf7.99 (normally, but occasionally on offer at half prince 3.99) in CH. (Guess where I buy it?).
It's a really good rounded wine, a tempranillo/cab sav blend, oak-aged for five years, IIRC. Could easily be mistaken for a very good Rioja and would probably be priced three or four times higher if it were.