6v6 Plexi transformer choice - UK suppliers

[MartinB]

I'm thinking about doing a 6v6 plexi (in the manner of Mark Huss, Sluckey et.al), and I'm currently looking around at what parts are affordable and easily available in the UK.  I might also add a 1-tube reverb, as I did this on a 50 watt plexi build for a friend and I was pleased with how it came out. 
I've found a couple of suppliers of power transformers intended for 2xEL84 18 Watt type amps which look like they would do the job: 
This one from Ampmaker has a single 275V 160mA secondary and with the 3A heater filament it should be fine with the extra ECC83 for the reverb.  But I would need to use a bridge rectifier and JCM900 style capacitor coupled bias supply.  The B+ would be somewhere around 360V, which is a little lower than I've seen on other similar builds but should work OK if I bias accordingly and perhaps adjust the dropper resistors for the preamp.  http://www.ampmaker.com/store/0-190-275V-20W-power-transformer.html
Alternatively, this one from ValvePower has a 290-0-290V  120mA secondary and 2.5A heater filament.  The B+ would be a little higher and I could use a more conventional bias arrangement.  Does this one look like potentially a better option?  http://www.valvepower.co.uk/transformers.htm
Both suppliers also have an 8K 18-watt output transformer, or I could use one of these if I wanted to try it with 6.6K.  http://livinginthepast-audioweb.co.uk/index.php?p=xfrmrvt1557 
Which would you go for?