Woody
I'm not familiar with the Job amp and preamp, but I own STs and drive them with a B&K EX4420 amp that is rated at 200 wpc.
Last summer I was able to directly compare my STs and a pair of KEF LS50s in my home, with my amp. While I liked the LS50, I agree with mick wolfe's comments – I'd take the STs in a heartbeat. The owner of the LS50s was buying a used pair of STs, and while he is keeping his KEFs, they have been demoted in status around his house since he brought home the STs.
In my opinion, the LS50 and the Salk SongSurround I are a closer match, except for the better overall treble of the Salk 2-way. That and the more than 50% higher price of the LS50.