magento customer discount percent extension

IN PROGRESS
Bids
12
Avg Bid (EUR)
413
Project Budget (EUR)
€250 - €750

Project Description:
Hello,

I need an extension as follow:

Each Product will be in an "Discount-Group",
each Customer will have 1 or more "Discount-Groups" with special discounts
on each group.

For that there will be an extra table for magento (must NOT be filled oder edited by magento admin)

The table may look like this:
discount-group | discount-percent | customer-id
DG1 | 45 | 123456
DG1 | 45 | 123456
DG2 | 48 | 223456

In frontend the must show the cheapest price for the logged in customer.
For example Customer 123456 for product 555 (which has the attribute of discount-group DG1 and standard price of 39.98 Euro and special price of 29.99 EURO, which is not cheaper than 19,99 :-))

Your price: 19,99 [EUR]
Normal price: 39,98 [EUR]
Discount: 50,00 %

But, if the special price would have been 9,99 Euro, it must be shown:
Your price: 9,99 [EUR]
Normal price: 39,98 [EUR]
Discount: 75,00 %

Skills required:
Magento, PHP
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