dude, as far as I know, the 147 and the Jcm900 are way out of the league of a SpiderII.
The spiderII's are great.
The others seem to be geared towards professionals (Ben Moody formerly of Evanescence used the Hd 147...and countless guitarists use Jcm900's) where as the Spider II is an affordable option for amateur/semi-pro guitarists.

I would go for the Jcm 900 personally, but thats just me...I'm sure both the Hd147 and SpiderII have their merits...and if you do find that the spiderII is just waht you need...then congratulations, you just saved yourself a whole wad of cash.