In reply to gilliesp: 1 -Dossing in your hire car for a week and biving is a good cheap option as there are not that many campsites in Blanca 2 - Cheap digs in Benidorm is a good base next to the motorway and quite central 3 - Rent an apartment although this can be costly and you will hardly use it as you generally start early and come back late.
For Multi-pitch adventure with a remote mountain setting - Leyva is an awesome place and you can get away with camping in the park if your discreet - Carrillo-Cantabella 5+ Carnaval 6a+ (about 3 meters of 6a+ the rest is easy) are brill routes.
Multi-pitch trad - Puig Campana- Espolon Central 4+ (HS) Every pitch is excellent and well protected, start early! Also Diedros Magicos 6a if your felling adventurous - Can Bivi in car park.
Multi- Pitch - Adventurous at Mascarat Gorge with cars whizzing below in an awesome setting - Boulder Terminar 5 + Llobet Bertomeu 5 + and G.E.D.E 6a are all excellent routes
Penon De Ifach - Diedro UBSA 5+ Sustained and excellent, a bit polished but doesn't detract, hard bits are short lived and no extra gear needed as its well bolted
Sierra De Toix - excellent single/multi-pitch routes and soft grading
Marin - Excellent single pitch - Watch out for snakes tho!
Sella - Excellent but busy on weekends
Echo - Excellent but some routes not as well bolted as other sectors
Hope this helps? I persuaded the in-laws to move out there 6 years ago so I get out there a fair bit now - Have a great trip