I will only sleep under 100% egyptian cotton and buy all my sheets from Overstock because I have yet to find another place that can beat the price. I only buy egyptian cotton because, through the years, I find that this type of cotton holds up better than any other. The quality of the sheets found on Overstock seems to be to be equal to any other egyptian cotton sheets sold elsewhere.
If I'm not sure about the color choice offered, I will usually buy white or off white. I love to dress up my sheets and pillow cases, especially if they will be used for company. I simply buy some lovely trim and use my sewing maching and sew it on near the edge of the pillowcases and even the top sheet, near the edge - an inexpensive and fast way to dress up inexpensive sheets to look like a million bucks! If you crochet like I do, making a very wide trim in white or off white for your pillowcases makes them look very luxurious and elegant and you can thread some thin, pretty silken ribbon in a color through the crochet, right at the top to "finish" off the look.
The weight of these sheets are very comfortable, for both summer and winter. I find anything more than 800ct. to be, frankly, too heavy to sleep under comfortably and to be too hot in the summer. This count is fine for every season.
However, in the dead heat of the summer, I drop down to 400 tc and am very happy with that weight. Light, crisp and cool. We live in the desert where the heat can become quite intense, even at night, so I like very lightweight sheets during the month or two of those very hot nights.
I like my sheets to have the "crisp" feeling. If you prefer the silky feeling, then always get the sheets that are advertised as "sateen" but if you like the crisp feel to your sheets as I do, always get 100 percent cotton that does NOT state them to be "sateen" and you will be happy with your purchase.