Hi,
I work as a digital eCommerce manager in Australia and have gone through 2 re-platforms of large scale ecommerce sites (multi-site and single site platforms). My remit currently includes SEO and SEM optimisation as well as working with affiliates.
I have worked with re-platforming email suites and have a very thorough RFP and tendering process.
My experience not only takes into account technological benefit, but commercial benefit in terms of ROI and capital and ongoing expenditure.
In short, my analysis and services will give you a complete and holistic recommendation based on budget, business requirements, roadmap as well as integration requirements .
Without knowing too much about your business requirements - the top 3 solutions are:
- Magento 2.0 - Community edition (recently released)
- BigCommerce
- Kentico