Advanced Bundle Extension

I was wondering if someone knows of a Bundle extension that is a bit more advanced that the ones I'm finding on the market place.
We want to be able to have a selection of different products that the customer can select from and get for 1 set price.

For example: We have 50 different items all priced differently. We want to allow a customer to choose 3 from those 50 items and get them all for $500 total. Or get 6 for $1000. ETC.

We also have the need for the already made "bundle" extensions and plan to use that as well. I'm hoping for a single solution that can do the simple bundling as in the packages already available, as well as add the feature I described above.

Does anyone know of a way to do this?

Thanks

well, you're asking a rather expensive Question, but you forgot to mention,
how much you would be willing to pay for such.
Still, some Solutions exist on such, but you need something Custom-Made,
and this will easy add up to a well-done 3-digit $-value moneywise, because it
takes a lot of brainwork and knowledge, to achieve such, as I assume...
Good Luck
Ernie
PS: And it's gonna be made version-specific, so, don't expect this to still work,
or be upgraded for free again, with/for later OC-Versions, if you ever plan to upgrade,
as the OC Ever-Newbies call it. Just to have it said !

You can build fixed-price bundles with Discount Chooser.