Don't get overworried about Malaria. Be really careful about taking preventative medicine. Although they have made huge improvements in the past years, prolonged prevention burdens your livier more than actually contracting the disease, and treating it on a timely basis.
I lived in malaria world headquarters (Nigeria) for over 3 years, and I only know one person who took the prevention, and she stopped after 2 months because of the side effects. All of the resident doctors (expat as well as locals) say to stay away from the profalactic (but always have a treatment at hand). If any of the symptoms pop up within two weeks of entering the area, get a quick blood test for Malaria, it takes 5 minutes.
I had it twice, so I speak from experience. Stay away from areas with a lot of moquitoes an hour either side of dusk, or wear long sleeved shirts and long pants and use autan. The pills are only an 80% protection anyway.
If you do however decide to take something, I've heard that Malarone is supposed to be mild as far as side effects are concerned (and there are some, anyone who tells you there aren't hasn't sat up all night trying to calm someone down who is hallucinating ....). Lariam and Resochin and the likes are supposed to be pretty bad, I'll have to consult my tropical medical kit, but I believe they are both Chloroquinine based.
Definately consult more than one medical source. I basically agree with canajungirl, but in this case the medical center "near you" (depends on where you live) may not know best. Don't count on European or American doctors to know a lot about Malaria. I came down with it once while I was in Germany, and they freaked because they werwnt used to treating this. They made me stay in the hospital for a week before releasing me. The next time I had it in Lagos, I just got a few pills and took 2 sick days at home.