the whole tonga vs. fiji vs. martian etc etc is a whole load of bollocks imo. When you buy rock, you want to look for the most porous (best for biofiltration) with the most interesting shapes (different shapes allow for more creative aquascaping). Where it's from is pretty immaterial; ive seen soem gorgeous pices from fiji and some not-so-good from tonga.
When i buy rock, i usually just sit around and watch over the classifieds. LR pops up frequently enough and usually the seller had already cherry picked it out, so it's usually decent rock at a cheaper price than from an lfs. If you can, try to get some from an established tank.
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