Advise, please, both free and paid scripts online stores.
Will be about 10 thousand items.
And of course, to be relatively easy to modify scripts and templates.
The site itself works on samopisnom engine (in PHP), so the corresponding plugins/components to the CMS type Joomla/Drupal do not need.
About WebAsyst heard from not best side. The decision from Bitrix expensive work.
Besides the title, please briefly write what the strong and weak (perfect 100% of the decisions because no, know) the part of the store. Thank you!