I completely agree with you about your last statement....."keep finding these near beach resorts, like ixtapa / zih" >> The rivers in that surrounding area, definitely really make for some freakin' incredible paddling. All three of those rivers (aguililla, laja, arteaga) are total classics. And the Aguililla is one of the best expeditions i have been on....they've got it all.....world class beaches, resorts, remote canyons, mota fields, guns, falls, slides, class v boulder choke, and amazing camping. Out of the 3 first d's that we did, i would say that the La Laja would become a commonly run river for those in the area ((easy logistical, roadside run))
As for those rivers you named, a tad bit north...well Rocky had already been into them and the reports were....that they were good. The Minititlan or as i call it " The Mini-Tit-Land" has some big falls on it's route down to the Maribasco. All near Coloma. We had very limited time (10 days) and crammed as much in as possible...save for 1 day of driving, we where out in the jungle for the rest of the time. So with that limited time, we only got on the ones that had never been explored.
So, it sounds like you know the area pretty well down there...we have some big plans coming up for '08...drop me a line at email@example.com
and we could possibly set some dates for further exploration down there.