Standard Edition One - Q about limits

I have to write an offer and as always customer wants to know how high he can get, despite his trivial needs :)
>From http://www.oracle.com/database/product_editions.html I can get
feature matrix of all editions including SEO and from http://www.oracle.com/technology/products/database/oracle10g/pdf/DS_General_Oracle_Database10gR2_SE1_0605.pdf I can get some physical constraints for SEO (i.e. no more than 2 processors).
Although I have two questions:
1. Are there any RAM limitations for SEO? 2. Last doco above mentions "Databases up to around 500 Gb of Data". Is this some kind of physical limitation or simply spun out of thin air number?

Gints Plivna

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