>From VFP standpoint, is it advisable to go directly to Web Forms? Or Win Forms would still be viable long term? Our system involves heavy inputs of data because it's a manufacturing system including Payroll, Accounting, Production, Inventory, etc.
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>I tried toying into Web Forms but the way I see it, it's not RAD yet. There are a lot of annoying beheviours even in design. Laying out screen design is not that easy. Another thing is the postback events...

.NET is a learning curve. It took me a while to understand the concept of postbacks. But, this turned out to be a very powerful concept. I wouldn't go back to something else once I got it working ok. If you develop for the Web, Web forms would be the way to go. WinForm, the way I understand it, would be for desktop applications.