I've seen the Magna's at computer fairs, the thing I like least about that style, is the intake fan faces forward, not down.
I have a 120mm single fan unit (450w) to put in mine now, to replace the original PSU (fan replaced when it failed and survived the cookout with no damage!), and two previous upgrades.
Failed so far:
1. QTEC 400 (or was it 450w) dual fan gold - had monster inaccurate negative voltages that put the system in bleep mode - taken back.
2. No-name LPG2-40 dual fan gold - voltages a tad low, then started to get powerdowns
The one I have, boxed, but no real reference for the name, is of a similar style to the picture on Scan's "Today only"
Â£7 + VAT carriage makes Scan a better option if you can get to the shop - mind you, that's the same carriage for a PSU or a pendrive - they are STINKERS for that!