Most cooks and many chefs are afraid of making soufflés, because a collapsed soufflé doesn't look good. However, there's nothing you can do about it - they will deflate after a few minutes, no matter what. The best thing is to get them on the table as quickly as you can after they come out of the oven.
Use any hard, melty cheese you like - gruyére is common, but I use mature cheddar.