Personally, I'm not a big fan of baserock. The stuff sold in stores is usually dense and uninteresting in shape. Volume-wise, you're not looking at a DRASTIC diffrence between $2.99/lb boulder base rock and $5.99/lb Fijiian liverock. I just can't justify the purchase of unattractive rock.
If we're talking tufa, that's a different story. While I'm not a big fan of it, I can think of several people I know who have used it as a cheap alternative to stacking pounds and pounds of liverock on the bottom of their tanks.
I guess in the end, it's up to you to decide what you want to do. If you're more for the open look, then go for the liverock. If you prefer the "wall" look, tufa or some other calcerous baserock is a cheap alternative.
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