I recently ran out of space on my 18 GB SCSI mirror, and can't justify
purchasing large SCSI drives when SATA are so much cheaper for my
purposes.

I am looking for a cheap well-supported SATA RAID card without
performance glitches in RAID 1 configuration.

Here are possible candidates:

Promise FastTrak S150 TX2+, TX4
LSI Logic MegaRAID SATA 150-2 Serial ATA Raid
Highpoint RocketRAID 1520 or 1540 or 1640
Adaptec Serial ATA Raid 1210SA (I've read somewhere that Adaptec's card
suffer from poor performance, is this still true for this model?)
Acard cards?

Thanks.