[support] alternatives to node_import?

I'm in the process of building a Drupal 6 site and I need to import around 5,500 records from a Filemaker database into CCK. I've exported a CVS file and I've tried the "node_import" module but I'm having no luck whatsoever as it's still a work in progress. I keep getting a dropped server connection or a blank screen when moving from step 3 to 4. Can anybody suggest any alternatives or a fix? I'm aware that users have used a previous version of Drupal to do the import and then upgraded, but I'm already fully installed on D6. Thanks, Marc