The rb is out of hte picture, but i think ls1 vs 2jz is a good argument really. Both are able to handle extreme amounts of power on a fairly stock longblock, good tq and power stock.. Stock 2jz obviously has the ease of modification potential by being able to up the boost to increase power.. But the ls1 has got the upper hand as far as displacement, and from what ive seen once boosted can handle insane amounts of power on stock block. Obviously for the power on hand $8k is a good deal for a 2jz swap.. the big kicker will be how much a ls1 could be done for if it were a more mainstream swap.