[GFischer]

At what kind of scale? I don't think any web application should have problems unless the queries are very badly designed.

I've worked with MS SQL for 10+ years (at financial institutions) with no problems. Oracle might be a tad better, but it's also pricier. No idea about Postgre (I've heard it's good), but what you mention shouldn't be a good reason to dismiss MS SQL.

[cakes]

I would also like to know at what scale as I've used MSSQL for several years and only badly designed queries/tables caused locking issues.

The real _problem_ (which BizSpark can resolve short-term) seems like it would be licensing.