Sequences in order - 10g r2 RAC

Hello, we have a j2ee application against Oracle 10g r.2, which uses sequences (over ten approximately). These sequences are used to assign automatically value to the primary key of registers of several tables.
In production environment, we have RAC with 4 instances. We would be interesting in maintaining the order of the values in this fields. We've defined these sequences as ORDER and CACHE=20, but after reading in forums and Oracle documentation, we've seen that the best practice is to define them (in RAC) as NO ORDER.
My question is, could we have problems derived from this type of definition (ORDER - CACHE) ? Our main thought is that is very important that the primary key are not repeated, and also maintaining the order. On the other hand, could we have performance problems with this mechanism ?
Thanks in advance.

with the ORDER parameter, what I'm trying to obtain is that the number given by the sequence will be 1,2,3,4,5, ....49,50,51,52,... regardless of the instance that provides it.Why? The only requirement for a surrogate key is to be unique! Where in relational design is it recommended/suggested that surrogate keys be numbers in a gap free ascending sequence?
This so-called "+requirement+" from developers for gap free surrogate key sequences are based on ignorance of relational design fundamentals.
Also, you are not even considering the impact on the RDBMS for wanting it's sequences to behave this way.
Think of a 100+ users, using a a 4 node RAC. All of them running typical OLTP apps that are inserted rows. All of which requires a sequence. For this to be ascending and gap free there can only be a single sequence generator on all 4 RAC nodes. As only a single generator can ensure gap free ascending numbers. This means that all 100+ users have to queue for access to this single generator to get a surrogate key value.
What does this introduce? Serialisation. What not only kills performance, but utterly destroys it on a server platform? Serialisation.
It is even worse on a RAC as instead of introducing serialisation on a single database instance, it will introduce serialisation on all cluster instances. Effectively rendering the whole RAC concept of scalability and performance totally useless.

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/dev/sda2              14        2053    16386300   8e Linux LVM
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Image: !http://img91.imageshack.us/img91/7448/oracle.png!

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