Newegg has the Mushkin Enhanced Chronos 2.5" 120GB SATA III MLC Internal Solid State Drive SSD (MKNSSDCR120GB) for $130 with free shipping. Features read speeds of up to 550 MB/s and write speeds of up to 515 MB/s.
Bottom line, there is a modest price premium for the better performing synchronous drives, where the slightly less expensive asynchronous drives will often have only 50% - 66% of the performance of the synchronous NAND drives.
Chronos is the Asynchronous version just like the OCZ agility 3
Chronos Deluxe is the 3Xnm Toshiba toggle flash version just like the OCZ Max IOps
And the point you are making #1?
Bottom line, there is a modest price premium for the better performing synchronous drives, where the slightly less expensive asynchronous drives will often have only 50% - 66% of the performance of the synchronous NAND drives.
What is an M4?
The bottom line:
asynchronous drives = inferior performance.
synchronous drives = superior performance.
OH, OK!!!! M4=synchronous drive xD