Yammy 1400 does video up conversion
download its broucher from yammy site for verification, here a cutting from it btw

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High Picture Quality
• Up Video Conversion to Component Video (S-Video and Composite
Video)
• Up Video Conversion to S-Video (Composite Video)
• Down Video Conversion to Composite Video (S-Video)
• HDTV (720p/1080i) Compatibility
• Wide-Range Video Bandwidth (60MHz -3 dB)
• 2 Component Video Input Terminals (fixed and assignable) and 1
Monitor Output Terminal
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dunno abt rxv740, not written in its broucher

rxv1400 is under 7/800$ i guess

regards