@iocase If you need something simple (inventory, billing, sales) try Dolibarr. If you need something more complete, try something like Tryton (Odoo 8 fork).
I do not reccommend Odoo, as the community version has limitations and you need a subscription un orden to use all the modules.
I sometimes check if my deleted comments are back, and I delete them again. I'll probably delete my account once I'm sure my comments are gone for good.