A Metal Zone when youve got a 5150?
SCREW that man, the 5150 is one of the best metal amps out there.
If I were you, I'd:
*Loose the Korg
*Loose the Boss (sell 'em on the bay!)
*Get an Ibanez FL9 Flanger (best flanger Ive heard for around $100, beats the pants off the Boss, Analog -> Digital anyday)
*Get a MXR Phase 100 (IMO, 10x more controllable than the 90)
*Get a Visual Sound H20, that'll knock out Chorus and Delay in one pedal!
What kind of Tubescreamer is it? Maxon? Ibanez? TS-9? TS-808? TS-10? TS-5?
Tubescreamers are handy, I'd keep that.
What volume pedal is it? if its a Ernie Ball or Boss, keep it. Rogue? Toss it.
What kind of crybaby? GCB-95? 95Q? Classic? Fasel? Hendrix? Vintage? 535Q?
If its the GCB-95, Id have it modded, they have a terrible tone sucking bypass, Id have true bypass installed on it.
After all that, I'd strap it all down with velcro and knock myself out.