I like the milder, creamier types of sauce - korma, pasanda, that sort of thing, generally with almond, or coconut in. I've never really got into the hotter sauces - I'm sure it's a case of developing an 'immunity' to them, but an Indian meal out is a treat, and I'm not keen to risk ordering something hotter and then not enjoy it. I like to be able to appreciate the flavours, rather than only feel the heat.
Of course, I don't know how 'authentic' the Indian food I eat is, I suspect a lot of it is tailored to suit western palates. I'm sure 'proper' Indian food has a wealth of variety we don't know about.