Is this a good setup? [Pro 6 + drives + switches]

I ran into the flow control problem most recently with my NTV550 media player. Like many media players, it uses 100 mbit ethernet (more than fast enough for BluRay). Without flow control, there is stuttering and outright playback failure when I play multimedia hosted on any of my ReadyNAS. Turning on flow control resulted in smooth playback (This was originally diagnosed with my GS108T). Flow control in the player wouldn't help, the packets are dropped in the switch (the queue overflows there, because of the downspeeding).

BTW, my older EVA9150 doesn't have this problem. So I suspect that the TCP stack in the NTV550 is set too aggressively. However, this is hard to confirm (and there are no user-visible settings anyway).

So I want 802.3x on all my gigabit switches, just in case I need it. There are several unmanaged switches that do it (including the GS608). Though I like the flexibility of having a managed switch.