SATA III in a Mac quad 2009 SATA II?  Want a fast boot drive, but would the SATA III be a waste?

Mac is SATA II and I need a new HDrive.   Quiet, boot speed desired.   Must the new hard drive be SATA II ?
Are hybrid drives (200 MB SSD) reliable and reasonably priced?
Thanks in advance.  

RE: SATA Bus speed:
Most Rotating drives available today, whatever their SATA spec, can source data off the spinning platters no faster than about 125MBytes/sec.
SATA 3 is rated at 6G bits/sec, which theoretically is about 750 Mega Bytes/sec
SATA 2 is rated at 3G bits/sec, which is theoretically about 375 Mega Bytes/sec
SATA 1 is rated at 1.5G bits/sec, which is theoretically about 187.5 Meg Bytes/sec
None of the SATA Busses is a bottleneck for consumer Rotating drives you can buy today. Trying to speed up the SATA Bus will not provide any real-world performance increases for Rotating Drives.
Even most common SSD drives are not bottlenecked by SATA 2.

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