Setting the size of a tablespace prior to its creation

Hi guys,
Oracle version: 10.2.0.x
OS: Windows 32bit
I was wondering if there are any 'conditions' in setting the intial size of a tablespace prior to its creation. This is because, one of our customers wants to export and import from one schema into another but set an initial size for a tablespace during its creation and prior to importing data into it, but we have a database wizard tool that creates the accounts/schemas by using the following underlying sql:-
CRETE TABLESPACE <tbl_name> datafile <path><datafile_name>.dbf SIZE 100M AUTOEXTEND ON NEXT 100M MAXSIZE 32000M DEFAULT STORAGE (INITIAL 256 NEXT 256K MINEXTENTS 1 MAXEXTENTS UNLIMITED PCTINCREASE 0) ONLINE;
Under normal circumstances, what he would do is to use our wizard tool and create an account and then import data from an export dump.
But he wants to create a tablespace using a SQL something like:-
CRETE TABLESPACE <tbl_name> datafile <path><datafile_name>.dbf SIZE 2000M AUTOEXTEND ON NEXT 500M MAXSIZE 32000M DEFAULT STORAGE (INITIAL 256 NEXT 256K MINEXTENTS 1 MAXEXTENTS UNLIMITED PCTINCREASE 0) ONLINE;
He thinks this should be ok because his export dump would be on size 2GB and would want to import all of that 'at once' i.e. without actually using autoextend feature for the first 2GB.
Does this make any sense? Do you guys see any difference 'performance-wise' between the 2 create tablespace statements?
I think the second sql (with size 2000M initially) seems to be a more logical approach but I am not really sure of the implications going down the line performance-wise.
Any help/input much appreciated!
Thanks guys

1) Provide the facility in your tool to change the default size of datafiles and keep autoextend off.You won't believe it...we had this option in a previous version but now it isn't there anymore!
But why turning off AUTOEXTEND? I mean, our customers are not meant to modify anything in the database other than via using our software, hence we would want our customers to just use the software as it is but have their DBAs monitor the growth of any datafiles etc...
2) Let your tool do what it is doing and then manually increasing the size of the datafiles and making autoextend off once you have created the tablespace and before doing import. This can be done by your tool or loggin to the database.We could do this, but we don't want our customers to manually finger the database as they are/might not be Oracle-efficient and wouldn't want production systems to crash for the same reason.
Hence we could just give them the SQL to be replaced with the 'default' one and then create a tablespace via the tool which would create a tablespace with an initial size of 2GB+ and with greater autoextend facility (such as autoextend on 500M) rather than 100M so that there are fewer autoextends.
Also, in your point 2, are you saying to turn off autoextend only for the import and set it back on by alter tablespace....?
Thank you.

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You were right that I am know to this, but getting there slowly and thanks for your help.
Cheers

Setting the size of a tablespace prior to its creation

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