use mac type ones they are the same..or just go onto ebay and type in boost solenoid..plenty there and ye will pick up a mac one for about 49 quid..AND they work,googlem them and you'll see they're a seriously good bit of kit,aem use them in conjuction with there ecu's.. apexi's are seriously over priced..imho.
i have a forged ep82,running 250 bhp @1.3bar on a td04,has wilwoods,quaiffe diff,power f.c,460 injectors,orc309 clutch,hks super silent stainless steel exhaust,etci may sell if the price is right.
i agree withj rubix cube...albeit i'm running a power fc. as well,the cost of getting a new standalone in and mapped is seriuos money compared to a plug and play power f.c.,and frazer shop about bud you don't really need the hand commander although it is handy,if people are building there cars with a limited budget,then i think they're the way to go.