You can use either a 175W or 203W PSU on a Falcon. I also have a Zephyr for £125 (Hitachi Drive), likewise I had to hoover the dust off the heatsinks.
I'm intending to Flash the Falcon's drive to newly realeased LT+1.1, although i've never flashed a drive blind before (ie without a dump of the orginal firmware). I've only previously flashed Benq's or 83850 V1's.
Both consoles are working fine with freeBoot 0.04(1)/ DashLaunch 2.07 and have fixed SMC's which allow them to use Play and Charge kits. Most JTAG's don't work properly with play and charge kits (consoles won't power off). Most people use JTAG have patched SMC's either from Xell or the JTAG tools floating, these use Jasper SMC's for Zephyr's / Falcons. All the consoles I have use patched SMC's from their original NAND Dump.
Of the other 3 Falcon consoles, the lighty used should have a Benq and the 2 BNIB should have 73450C's (from their manufacture dates). I will try and JTAG them before the end on the week, because of my health issues I should JTAG them sooner them rather than later...
They've reworded the terms of PayPal's user agreement when selling offsite (ie not on eBay), so I don't know if I would get seller protection shipping to Germany outside of ebay. But if you're prepared to pay the eBay fees, there's no reason why I couldn't do you one through eBay aslong as your address is confirmed (I won't be able to list it as a JTAG as they are banned on eBay). I assumed you would have got yourself a console by now.
Jasper Arcade 256MB
Jasper Arcade 512MB
Falcon Arcade
Zephyr Arcade
Note the temps in those images may be slightly misleading, The consoles weren't on for any specific time, just to take photos which stated the m/b version. The temps only displayed to get the IP addresses assigned from the router (I reserve each console an IP in my routers settings) so I knew which photo belonged to each console. Reserving each console an IP addresses allows you to block them connect to XBOX Live by blocking the IP Range 65.54.0.1-65.55.255.255, you then need to add an exception for 65.55.42.202 so FSD2 can download game covers & screenshots.
If it were me, i'd run the Zephyr fans at 100%, the reasonably used Falcon at 90% (provided fresh thermal compound drops the EDRAM temps, ironically the CPU temps are lower than any other console i've had), the new/ lightly used Falcon should be fine having the temps tweaked to aim for 60C although I have my Jaspers tweaked to aim for 55C. It all depends on how much noise you can put up with.