Looking for either an HKS SSQV or a Turbosmart Supersonic for my 2003 STi UK

Had an SSQV on my classic and loved it...there's a turbosmart on here but he's asking far too much for it second hand

 

Would you be interested in a GFB Mach 2? From what I've read about the Turbosmart, the sound volume would be pretty similar. I got mine bundled with an STI tmic I bought, but don't want to run VTA so have no use for it. New retail price was around £130, while they were still making them up until a couple of years ago.

Pic and a bit of info on the Mach 2 here (around halfway down page):
Subaru Tech at Graham Goode Racing

GFB's website here (only has their new model BOVs, but gives you an idea of what they're like as a company):
Go Fast Bits

Pics of my actual Mach 2:
gfb_dv01a.jpg - Windows Live
gfb_dv03.jpg - Windows Live

It's a very solid feeling piece of kit. All billet alloy, base flange 10mm thick, body around the same, all metal brass-coloured piston, top and base both held on with stainless steel hex-socket bolts. Adjustable using the thread-screw at the top, and should be good for easily 30PSI, judging from the strength of the spring.

Perfect working order BUT the previous owner ground off a small wedge on the corner of the top (see 2nd pic), probably to get it to fit past something else in his engine-bay, so only asking for £35 posted.