Your site has a “Top 20 ERP” report, but what are the best choices in SaaS-only ERP systems?
NetSuite has always been offered as a SaaS-only solution since its inception and caters to the needs of small, midsize, and now enterprise companies. NetSuite offers financial, CRM, ecommerce, inventory management, and PSA features, so depending on your needs, it may offer you the solution you're looking for.
Many of the on-premise ERP vendors have released Saas or Cloud versions of their software. Depending if you are looking for an ERP for services, manufacturing etc. they all have their own areas of specialization.
To start you may want to examine:
Microsoft Dynamics through their business partner channel(MS to release their cloud versions soon if not deployed already)
The list goes on but it all comes down to your requirements.
Don't forget to consider Blue Link Elite (www.bluelinkerp.com) in that listing.