Migrating Your SAP data from 3.1H to ECC5

Dear All,
We are starting a project to upgrade to ECC5.
We currently run a 3.1H system and because of the huge gap between 3.1 and ECC5, we have decided in effect to re-implement SAP, therefore migrate all config and data.
Can anyone point me in the direction of a guide to which order we need to load the data into the new system please?
E.g. Chart of accounts first, Cost centres second, profit centres third and so on.
I have a spreadsheet that gives me information but it is so old and differs so much from our upgrade partners that I would like some help.
If anyone has any suggestions please let me know.
I have already been to SAP sercive market place, here on SDN, service market place LSMW and LSW pages but to no avail.
Thanking you in advance,
Nigel.

Really the "huge gap" that you refer to is no different the one that many companies faced a few years ago when most upgraded from 3.X to 4.6X. 
I have been through a 3.1H to 4.6C upgrade and am now preparing to go from 46C to ERP2004 (ECC5.0).  I can tell you that from a Business Functionality side - all the big differences really came in the 4.5 and 4.6 releases.  There is relatively small (mostly optional improvements) going from 46C to ECC 5.0. 
A few years back as people made the jump from 3.X to 4.6X, I don't think many people took the approach that you are describing.  Unless you have heavily modified your SAP system with core modifications or you screwed up your implementation and want a chance to start over, there really shouldn't be anything so drastic in the upgrade that makes you need to reload all your data into a new system.  Thousands of companies have already been down this road.  Sure the upgrade isn't going to be painless, but I can't imagine reimplementing and migrating all your data will be any easier.

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