Check two places: pricewatch and Newegg.
Pricewatch gives you a general "historical" overview of both the newest and oldest chips, while Newegg gives you a look at verey reasonable prices on the correct steppings for the newest lowbies (like 1700+ TBredB chips). Those two sites will give you a peek at the exponential rise of cost per speed. At the low end, there isn't much price difference per raise in speed, though at the top it jumps by huge percentages per minor increase.
You could do it really easily: plot the 1600+ through the 3000+ for current processor pricing with the X Axis showing speed and the Y Axis showing cost.
Here is some data:
1600+/1400/$56
1700/1466/53
1800/1533/65
1900/1600/89
2000/1666/79
2100/1733/94
2200/1800/118
2400/2000/147
2600/2080/247
2700/2166/330
2800/2250/395
3000/2166/590
These are OEM costs from Newegg (the 3000+ price is speculated from rumor). You make the call. If I can make that $53 1700+ run as fast as that $247 2600+ ... you get the picture, right? It's an easy sell to a customer if you sell OVERCLOCKING services along with computer building. They just need to be told the bad with the good to CYA.
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