SATA port multiplier recommendations?

[dieterbsd at engineer.com]

Does anyone have recommendations for/against specific SATA port 
multipliers?
Do they all work well with FreeBSD?  Is one faster than the others?
Can they saturate the uplink, or do they suffer from the same slowness
as the sil3132 and jmb363 controllers?

So far I have found:
        Sil 3726
        JMB393
        Marvel 88SM4140
Any others?

http://www.addonics.com/products/host_controller/tutorial_pm.asp
indicates that the JMB393 has more features than the Sil 3726,
although I think I can live without those features.  I haven't found
any products using the Marvel chip.

I was hoping someone would have a port multiplier with a 600 MB/s uplink
by now?