7150 was the original set. 7152 was a [email protected]
re-release of 7150. They are basically the same set with a different number.
7262 was the TRU exclusive re-release of the set in 2004, after the color change. The set has a different part count, and all the grays are of the bluish variety. I assume these fetch a high price because there aren't as many of them floating around. Keep in mind that for something to be a good investment, you have to be able to sell it eventually, for more than you paid. Sure, BrickLink prices are $90 and up, but nobody has bought one of these sets for the past 6 months, at any price. That tells me that there isn't really a market for this set at inflated prices.