Your requirements:

• I want to secure commercial transactions / to secure sensitive (customer) data
• Performing more volume than 50 transactions per week, and / or
• Performing transactions exceeding the value of $50

We recommend that you use a GeoTrust Professional Level Certificate.

GeoTrust certificates are 128 bit single root SSL certificates. GeoTrust owns the root used to issue GeoTrust certificates and is already present in all popular browsers. GeoTrust issues highly trusted, Internationally accepted professional level and enterprise class certificates and are a highly respected and established WebTrust compliant security organization.

Click here to view the GeoTrust product page