Car leasing Bangkok

Hi - my company is relocating me to Bangkok for 2 to 3 years and offering a monthly allowance for leasing a car - I would really appreciate any suggestions on where to look for typical lease costs and to see what car models are available in Thailand - beyond a hazy idea that non locally made/assembled cars are prohibitively expensive due to import tax I know bugger all about the Thai car market.

Thanks for any help you can offer.