I would climb Parinacota or Pomerape in March 2014.
Someone else?

Could SPers send any good informations and companies/guides in Bolivia (LaPaz) to hire?

Thanks a lot!

I can recommend Bolivianmountaingiudes.com without reservations.

I used them for two trips including Parinacota. Are you also interested in other nearby peaks? If not depending on your skills and comfort level you might be fine without a guide.

Good luck whatever you decide.

Woodie