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The SBIG STV was discontinued in March 2006. You can still pick them up reasonably cheap through Astromart.
The ST-402ME is the current successor. KAF-0402ME CCD makes a great autoguider - very sensitive. Not many players are using CMOS due to the lack of sensitivity. Certainly cheaper than CCD, but if performance is what you're after in an autoguider i.e guiding on faint stars, stay away from CMOS.
A new standalone autoguider by SBIG is anticipated in Sept-Oct 2007 timeframe. It is labled as the "Smart" guider and uses a KAI-340 CCD chip. More info can be gathered at http://www.sbig.com/aic2006/AIC2006.PPT
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