Stereo amplifiers

Here's my short list of stereo amplifiers. So far I've heard marantz pm4001 and marantz pm7001, and i've heard system fidelity sa-250 and system fidelity sa-300, and here's my list. (I've listened to these particular amps since i've heard from high end people that these ones are good).

(1. System Fidelity sa-300)
1. System Fidelity sa-d30(15watt digital small plastic thing, that can be driven by battery)
2. System Fidelity sa-250 (320$)
3. Marantz pm7001 800$
4. Marantz pm7001 KI 1100$

Since sa-300 is too expensive, it doesn't count.
I'm right now comparing Sa-250 with Sherwood rd-7500 and it's looks like the sa-250 is att better choice, but I'll will come back when the test is over.