Here's how I compute it.
Phase Spider Carapace : Weighted value now = 239
140 ac, 6 str, 2.5 Dex, 36 Sta, 21 Int, FR (1.5), DR (1), CR 2.5, MR 6.75, PR 2, HP 25.
Architects Chestplate : Weighted value now = 233
150 ac, 12 Sta, 15 int, HP 33, Mana 19, FR 2.5, PR 1.25
I think I'd do the trade - the items are almost equivalent at your level and the Chestplate will only get better as you gain levels.
Edited, Wed Apr 28 13:52:36 2004 by MRRX