Enhanced Recurring Payments with Website Payments Standard Issue

Enhanced Recurring Payments with Website Payments Standard Issue

Problem: Trying to pass along a variable Monthly Subscription cost to
PayPal based on user-selected options on the form I created with more
Values From Anothers Standart Products. Working Within Website Payments
Standard with Enhanced Recurring Payment option.
Details: User visits "shop" page, Which Is a form with four line items,
each line item Consisting of 2-7 options, each option with an associated
price.
For example, line item 1 is "size of business" with the options being: a)
1-10 employees - $ 20 b) 11 - 20 employees - $ 30, c) 20+ employees - $40
he also bought an item with a fixed value $ 25, that is out a Recurring
Payment.
Is this possible?
What is the correct way to solve this problem by api paypal? It is
possible to attach a signature and a normal purchase in the same shipment?
What about Adaptative Payments to solve This Problem?
Thanks.