If you ever have a shot at an SS4 take it. Awesome knife.
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Out of all of my collection less than 11" of blade, the ones I really treasure the most are the SS4, S5LE, Ratmandu, and NMSFNO. I spent at least a month looking for an SS4 for my dad for christmas last year with no luck, then I put up a WTB on bladeforums and got 3 responses and took them up on all of them. I just can't say enough about the SS4 and S5. There is a substantial size diference but I think both are easily the best blades available in their size range. I'm hoping I'll like the BushWhacker even more than the NMSFNO.
If you don't already have an S5 and you see a Ratmandu before you find one, it is a very worthy substitute.
I've been working on hand-full-convexing an SS4, RMD, and S5LE for several weeks and I'm really happy with it. I moved twice in 6 months and haven't recovered yet but if I can find my camera stuff I'll put up some pictures.
Nobody can touch Scrapyard INFI. I'm really feeling the INFIcoot though <img src="/ubbthreads/images/graemlins/tongue.gif" alt="" />