If you look at the Big List of Mobile Processors (CPU Benchmarks) you'll find the i5-2430M ranked @ #44 and the A8-3500M ranked #136.
The AMD A8-3500M quad core APU trades some CPU horsepower to get a better graphics option - Radeon HD 6620G - on the APU package. Still, a capable performer and worthy of consideration if you get a very good price break over the i5 models.
For a business class multi-tasking workload I would go with the Intel Core i5-2430M. That HD 3000 Graphics on the CPU is roughly equivalent to a Radeon HD 5450 or Geforce 310 dedicated graphics card from a couple years back.
I ended up going with the Latitude E6420's. They had a special deal through the AICPA, so they only ended up costing $1300 a piece, including the extra $400 for 2010 office professional. They have the new i5 in them which is nice, and they come with the 3 year warranties which is the main reason I went Latitude over Vostro.
Thanks for all the reply's I think everyone will be happy with there new laptops!