Get the Rabies & the Jap E done, but forget about malaria tablets, unless you are going into the jungle (each countries pharmacy will advise which areas are malaria prone). Its only the UK nurses that go overboard about the malaria tablets. They dont advise you to use them in most other countries - its odd that the UK make a huge fuss. Ive been all over the world and didnt bother.
In India I did as the locals do and used antihistamine tablets and cream, in Thailand I drank Vitamin B12 & had garlic tablets, and everywhere else I used the local sprays.
Dont bother buying mozzie spray in the UK either, its too expensive and ineffective. Wait till you get to the country, buy it there.
Thailand has a fantastic health service, if you are flying direct to Bangkok, I would suggest you get your injections done there, its so much more cheaper. Its also fabulous for anything dental too.