Is the Pro a worthy purchase? I need certain features, such as email protection, some support from the Avira team (for anything that requires more than basic/medium troubleshooting) and credit card/identity protection. I don't mind paying for excellent quality products as long as they deliver on their promise. I also prefer using a complete security suite over dealing with individual programs.
Avira Pro does not meet your criteria. In my experience the Pro version offers little over the free version.
Avira offers 30-day trials for all their products. Search for "Avira trial." If I recall correctly, they are buried on the Avira website.
For better identity protection you may wish to take a look at Webroot. If you are using W8\8.1 Webroot's firewall controls are disabled - not because of Webroot, but because of Windows. Use BiniSoft's WFC. Webroot, VooDooShield, WFC all work well together. Webroot support is good. Only downside is Webroot is not the best option for metered connection - if that is what you use. Same applies to Avira... due to constant Cloud connects. Could present problem under certain conditions.
Althernatively, you can combine your AV of choice with Quarri's MyPOQ for all online financial transactions - it creates a remote-hosted, sandboxed IE-only browser session with all extensions, add-ons disabled... along with session-only remote cookie against MitM\MitB attacks, etc. Visit Quarri.com to learn more - I put up thread about it here at MT under "Other Software." Note however, Quarri MyPOQ can be tampered with livecomm.exe - so you will have to temporarily shut-off livecomm.exe then use MyPOQ. After restart livecomm.exe. It is a known issue that Quarri is aware of - but very slow to fix...
Norton at customized settings is good protection too...
Any how, these are just some suggestions based upon my experiences with various AVs. Others will have completely different recommendations...
There is only so much one can do to protect their system using software as there is no "Nuclear Option" that will prevent every single malware\vulnerability. Also, guard against trying to create the perfect impenetrable IT fortress... I know that is the natural inclination - to add 378.3 layers of protection - but it will only serve to drive you nuts...
Pick good base-line AV and then accessorize to meet your basic security needs. Beyond this your knowledge, experience and computing habits will be the sole determinants of whether or not you are infected or data is stolen.