On SPListItem Update - how to cancel the workflow and restart it?

Hi, I use SharePoint 2010 and have sequential workflow + event receiver done in Visual Studio 2010.

Current scenario:
An event receiver starts the workflow if column Amount has a value.
All works good.

Change request:
When the workflow is running - and list item column "Amount" is increased then the workflow should restart.

Question:
Is above possible in Sequential Workflow? How?
Or will need to change it to State Machine Workflow?

Thanks a lot.