Back from the dead...
If anyone has tried these drive systems pipe in.
Storcase (Kingston) has what looks to be reasonable low/midrange drive chassis. For SOHO I'm gravitating toward what fits in a tower. They also make standalone versions but these fit four 3.5" swap bays in the space of three 5.25" bays. Others exist that fit 5 in the same space (sideways) but I'm not as happy with the construction.
<img src="http://www.electronicsoutfitter.com/images/items/s21j110.jpg">
http://www.storecase.com/dataexpress/de400.asp
$302 from discounter (w/carriers). Hot-swap (soft-start) safe for both SATA and PATA. High duty-cycle carriers. Cableless carrier->drive connection. Each bay accepts SATA or PATA carriers - connection to host is all SATA. Steel & aluminum construction. Carriers are compatible with their 12-bay InfoStation enclosure system. Single 8cm fan in back. Free 24/7 support and 7yr warranty, 3yr on fans.
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<img src="http://lib1.store.vip.sc5.yahoo.com/lib/cooldrives/RJR400-rack.jpg">
http://www.storecase.com/rhinojr/rjr400.asp
Inexpensive. I'm paying $108(!) w/carriers from discounter. ($140 from cooldrives.com) Same idea as de400 but carrier mating doesn't look as precise or durable. Not for daily drive changes. Only accepts SATA drives. Hot swap safe. SATA host connections and power on backplane. Aluminum w/plastic face & back. Single 8cm fan at back. 2yr warranty & free 24/7 tech support.
I'm sure the rjr400 is less capable (I've seen it with import labels) but I feel much better having Kingston behind it even if it isn't their design.
Oh, this is all SATA 1.5G.
I'm tempted to try two of these for a six drive setup in four 5.25" bays. Six has always been my magic number for small business servers, but cost objections usually put on the brakes:
<img src="http://store1.yimg.com/I/cooldrives_1856_812557">