I use 23's exclusively across the board. I'm 230lbs, and inflate to 120psi. I get a good, solid ride that is responsive, smooth, and comfortable.
One thing - cheaper, low thread count tires aren't as supple as higher quality ones. If your tires feel "flat", something is amiss.
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"Love is not the dying moan of a distant violin, it’s the triumphant twang of a bedspring."
S. J. Perelman