MacOS X Lion outsourcing iMac boot disk on the SSD!

I just have some time on the relatively long load times on the internal HDD (640 GB) annoyed my iMac24_early2009. Reciprocating in the consideration whether I still want to outsource to the 128GB SSD boot my system with Mac OSX Lion and connect via the port on the iMac Firewire800 !?
Have quite a few reviews about the futility such - not internal procedure - read. Keywords: bottleneck effect. Nevertheless, I have finally decided the Samsung 128 GB (without mounting material!) Incl. The housing SK-2500 2xFW800 / USB3.0, SATA int. Housing 6.4 cm (2.5 '') to purchase and my "luck" try.
When the delivery arrived home and unpacked, I have leveled at me to format the SSD. Previously, I have this course built into the absolute quality housing. A breeze and it fits perfectly !! Then then had no problems with the internal utility from Mac to format the SSD. Within not even forty seconds, the drive to Mac was prepared.
So, then so ran to the deletion of the internal HDD and re-loading of the operating system on the SSD. I think I'll have so used to the 25-30 minutes, until the system was uploaded. Then the decisive moment: If it works ......... ......... JAAAAAAA everything works great.
Subjectively appeared already the installation of the individual components to run even faster to me. Krass !! After 2-3 hours I had done everything. The system was again fresh up to date.
However, It should be noted even at the outset that I have completely outsourced large volumes of data such as movies, iTunes library and Aperture 3 on my other external HDD Western Digital MyPassport Studio 1TB External Hard Drive (6.4 cm (2.5 inches), 5400rpm, 8MB cache , FireWire).
This WD HDD I have also connected via Firewire to the still free port of the external housing.

And unfortunately here was the problem in detail. After turning off the Mac and subsequent switching on of these did not recognize the boot partition of the SSD !! Crap, I thought, now what !? So again everything forward front made. After the procedure but then after turning back the problem !! But because the problem was where damn !? When I off the SSD using the mini switch on the housing and have turned it worked so again. Since Lion was yet !!
So in troubleshooting:
My problem was that I have just connected the Western Digital HDD also to the second port. When I connected it via USB to your Mac, then worked even booting the SSD !!
But I did not want to anyway. Both drives should now run, via FW800, so I can use full speed. So, I first thought of a HUB 1394b Delock Delock 4 port IEEE 1394b FireWire Hub / Repeater. Certainly not bad to get extensions on the Mac. But how to do it first without that box?
So I've made the right thoughts that maybe it could also be that the Firewire port due to its continuous power supply (unfortunately) not enough applied current for the SSD. Thought right? So fast nor the power adapter plugged in out of the housing and also ...... therefore no improvement! :-(

***** **** ADDENDUM
It works only with the clearly designated Firewire800 HUB Delock Delock 4 port IEEE 1394b FireWire Hub / Repeater.
On Port 1, I then connected the SSD, on port 2 the Western Digital and Iomega External Port 3 another.
Thus, no boot problems are more :-)

Thus, although I can with some effort, but with considerably much benefit, with a clear conscience, the Samsung SSD incl. The SK-2500 and recommend to the Delock Hub!
So who thinks as a Mac user to the external switch to an SSD and does not want to go to the procedure of internal solution, which I can only guess at this "backpack variant" !! Absolutely brilliant, and certainly better than to work with the internal HDD!
Buy Combined :-)