Kreitler roller buying help: Challenger or Poly-Lyte?

Am trying to decide btwn the Challenger w/Headwind fan vs. Poly-Lytes.

I've been told the larger drums have a more road-like feel, but am not sure about the lower resistance. I usually read 3-4 times/wk, 20-30 miles @ 16-17 mph. Will the larger drums provide an adequate workout w/the headwind unit, or should I go smaller?

Try supergo.com alloy rollers. on sale for $95. I've had em 2 weeks and am VERY satisfied. My road average is 20mph and I've got my bike in middle ring middle cog when riding the rollers. Plenty of resistance.

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'05 GF Cake DLX SRAM X-9, 'Zocchi MX Comp, Avid BB7
Trek Equinox 7: 105, all stock, all fast
'99 GT XCR5000: LX/XT, Avid SDs, Judy XC
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Life is short, ride hard. BONZAI!!!!

Trust me, you can get all the work you want with the larger drums, even without the headwind. Put it in a high gear and spin for half an hour and you'll see. With the headwind it's like, well, it's like riding into a constant headwind.