Everytime I buy sheets, the thread count gets higher. We've got 800tc, 100% cotton now. Poor DD only sleeps on 400tc, but she likes a sateen finish, which makes them a little softer.
Once you switch to a higher thread count, you'll never be able to go back!
Look at Overstock--I've gotten some really good deals there!
When I got married a long time ago, I got some very good sheets at my shower. Well I didn't even know what they did to me, until much later I bought some cheap ones. Needless to say I didn't have them long and then bought some better ones. Well awhile back when I bought those pillow cases I thought I was doing good but they wrinkle and are rough, so now I'm scared to buy sheets. 

I have 800 thread count dheets - LOVE THEM!
www.linensource.com is also a good place to buy high thread sheets.
shhhh but you could get great sales at Kohls too!
I don't think I would buy less than 400 again....
Another thing to consider is the type of cotton and the weave:
There are several types of cotton:
Pima Cotton - Previously called American-Egyptian, Pima cotton is a generic name for extra-long-staple (ELS) cotton grown only in the Southwestern United States, Australia, Peru and in very limited production in a few other locations around the world. Pima cotton is an excellent-quality cotton that is exceptionally soft, and the fibers are strong and firm. Cotton is considered to be ELS or Pima if the fiber is an inch and 3/8 or longer.
Supima® Cotton - A premium fiber created from 100% extra-long staple cotton grown in the United States The term Supima is a licensed trademark owned by Supima and its members. It is used to promote textile and apparel products made of 100% America Pima cotton, but is strictly controlled by the grower organization. The name Supima is an abbreviation for Superior Pima.
Egyptian Cotton - Cotton cultivated in Egypt that feels softer than most cottons. Generates less lint and is more durable.
Cotton comes in several different weaves:
Cotton Sateen - A satin weave cotton fabric that has a soft, smooth feel and a gentle, subtle luster. Produced by floating fill yarns over warp yarns that are interlaced in such a manner that there is no definite, visible pattern of interlacing.
Cambric Cotton - A soft, closely woven fabric with a calendered, slightly glossy side. This good quality, 230-thread-count fabric is used with most of our down products.
Percale Cotton - A medium weight, plain weave, low to medium count (180 to 250 threads per square inch).
Flannel - A soft, medium weight, plain or twill weave fabric, usually made of cotton

Okay great, now which one is the softest without wrinkling.![]()
Okay great, now which one is the softest without wrinkling.![]()
Wrinkling is definitely a problem! We only do sheets when we're going to home when the dryer is done. We put them on immediately--and that helps a lot with the wrinkles. No way am I ironing king size sheets!
Anyone with a better idea, please let me know.
As for wrinkling, I've never had a problem with pima cotton, so long as I don't leave them sitting in the dryer. I recently bought some Egyptian cotton and hated them. They came out of the washer wrinkled and out of the dryer just as wrinkled. And I took them out as the dryer was still tumbling.
I rewashed them and didn't let them spin dry as much, thinking they would wrinkle less. Nope. They looked like those broomstick skirts....nothing but wrinkles. They went back to the store. It's pima cotton for me from now on. I am not ironing my sheets. 
http://www.springs.com/corporateinfo/ourbrands/wamsutta.asp
wamsutta are the ONLY sheets I will use, and they have to be the sateen 400 or more count!
