I personally found my MQ a bit too hot for a true P90 tone - great if you want Doom-y stuff but not so good for rootsy-bluesy stuff. They may have changed the spec since then though?
McSoapies aren't that common/popular, although the odd few do crop up, but they're always a bit pricey IMHO.
Maybe try MQs and see how you get on, or even the Manhattans?