Hi,
I was going to run an air to water IC on my '83 ZXT last year but decided against it for a few reasons.
1) You need to get a separate electric pump (like a marine pump) that is always cycling - extra load on your alternator.
2) You will need to get a separate rad for the air to water set-up, so installing this would be similar to mounting a front mount air to air IC - brackets etc
3) Quite a bit of extra plumbing
In addition, the cost was going to be a bit more than the air to air front mount IC, by the time you buy an air to water IC, the electric pump, and the separate rad. At least the separate rad you can get cheap at the scrap yard, but the other two items will have to be bought brand new and air to water ICs are not cheap! I bought an Isuzu NPR front mount IC off ebay for $200 and the plumbing will not be too expensive.
If you prefer the stealth appearance of the air to water IC thats cool, I actually prefer to see the shiny aluminun end tanks on a front mount unit.
Well good luck and let us know what you decide.
Regards - Yasin