Recommend a script that uses a form to upload to a server, etc.

I'm looking for a really good form script to purchase.

I'm working with several companies that need to transfer large graphic files from a local PC to my server and back to a different PC.

I've messed around with a couple scripts already and they either aren't working or are not very robust.

Here's what we need to do:
1.  My Client's Customers need to upload large graphic files (some in MAC formats from MACS) to my server, using an online PHP form.
2.  Once the file is uploaded - I'd like to email my client that his customer has uploaded a file; and I'd like to send my client's customer an email saying that the file was uploaded successfully.

That would be great.

I've had such good luck with EE script recommendations . . . so I hope you know of a really good one.

Many thanks, April

Question is urgent so 500 points