personally, I would go with a big muff

Ibanez S370 (all custom)
Mesa Boogie Studio Pre
Fender Champ 25se (used to power Mesa pre)
Custom 2x12 cab w/ Eminence Texas Heats
mute pedal.... or volume pedal set at 0. Ha.. nah i dunno... I'm mean.
Mesa Dual Rec/ Mesa 4X12 cab
01 PRS Custom 22
06 PRS Singlecut Ann.
1965 Fender Mustang
Ibanez acoustic
AceFrehley Epiphone LP
Takamine Explorer
tr-2 tu-2 / EHX DMM / MXR Script Phase 90 / SMM w/ HAZR
WH-1 Whammy / 535Q Crybaby
The Boss is such a good pedal, though. Last I checked Boss effects were analog...am I wrong? The Big Muff might be a bit too fuzzy for punk, but it gets damn close.
Telecaster - SG - Jaguar
Princeton Reverb, Extra Reverb
P-Bass - Mustang Bass
Apogee Duet 2 - Ableton Suite
The rat and EHX Big Muff would be great for punk.

Except you might not get them under 80$, go used.
Dude, you have a classic, it should get Anti-Flag. Just get an overdrive to boost it. Get a SD-1 by Boss. 40 bucks. Anti-flag aren't very high gain at all.
fool around with your peavey, once it arrives, before you go about buying a pedal for it. you might decide you don't even need a pedal. if not, you'll know how much more gain you need out of a pedal and whether or not you need a distortion or an od. weren't you praising the spider just a couple of months ago?
I know, I'm not gona go buy a pedal yet, but I think I'm going to need one later. I don't plan on getting one anytime too soon. When I played it at GC it didn't seem to have that much gain, but it could work. I just want a pedal incase I find out that it doesn't have enough gain for Anti-Flag and some other stuff like that, a little harcore punk stuff.
i use my ds 1 for punk on my classic 30
MY Music
Chute CC-04 2x12
Fender American Deluxe Strat SSS (with DG-20's)
Martin Dx-1
Big Muff Pi Tone Wicker
Keeley Mod Bluesdriver
Holy Grail Plus Reverb
MXR Carbon Copy Delay
Boss RC-2 Loop pedal