i doubt many seats actually sit lower than the standard ones..
most ppl find with seat conversions esp prelude-style buckets that they end up sitting higher than standard.
I have supra *A6* seats in my car -TA23- and they sit a bit higher than my old ra28 with standard buckets.. id stick with the stock seats to tell u the truth, just get them re-trimmed nicely and filled up so they're extra soft and support you on each side a little more..