This would be my first choice in a 7" tablet:http://www.google.com/nexus/7/
However, these are the only Schwab apps I found:https://play.google.com/store/apps/developer?id=Charles+Schwab+%26+Co.+Inc.
Edit: Just realized you are looking at (not for) a Windows PC Tablet. Post a link to what you are looking at. One GB of ram probably won't run that program very well. I will be slow and possibly stutter.
If you want to go bigger Dell and Toshiba make an 8" and the MS Surface Pro's (10") are nice.
This is a 7" that more than meets your specs but it is pricey:http://www.neowin.net/news/panasonic-reveals-7-inch-windows-81-toughpad-tablet