The problem you'll have with either of those monitors is they both use a TN panel, which is considered the least consistent and color accurate type available. Unfortunately, the vast majority of LCD monitors available have a TN panel. The two other types of panel available, S-PVA and S-IPS, are much better for photo editing, with S-IPS panels considered the best.
Unfortunately, getting a 24" monitor with a S-PVA or S-IPS panel will cost a lot more than what you can get those two models for. The Dell 2408WFP is considered a pretty good monitor for the price and does have a S-PVA panel. Here's the link:
Dell : Dell UltraSharp 2408WFP 24'' Widescreen LCD Monitor with Height Adjustable Stand : Monitors : Small & Medium Business
Finding out what panel a monitor uses can be difficult but here's a site that has a database:
www.flatpanels.dk - Din guide til fladskærme - Panel Search
Michael