I am quite short and although not really overweight my thighs are chunky. Can you recommend a style of jeans I should try?
A bootleg style trouser is a good place to start. Bootlegs flare slightly at the knee, so help balance the appearance of your thighs.
I've also had a number of women convert from bootlegs to the straight style. This gives a slimmer look overall and they look hot.
My advice would be to try a number of different brands in different styles. Take someone along for a second opinion. A good place to go is a jeans specialist such as Just Jeans, Jeans West or an independent store. A great brand for women is "Not My Daughter's Jeans" - designed by real women with lumps, bumps and curves. Their jeans are ultra comfortable and, as I say, accommodate real women. Their jeans are expensive but I believe it's worth investing in a flattering and comfortable pair of jeans that you can thrash and look and feel great in.
Darker jeans will also help to give you a slimmer look - dark blue or black. Wearing a heel with your jeans certainly helps to elongate the appearance of the leg. It doesn't have to be a high heel.