That sounds like a good idea and I'd be able to play any game from any region like now, right? Also, I own another unmodded Xbox too but it doesn't have a big HDD. Best solution might be to softmod that one and get a big HDD, though I don't know how to do that.
I found this softmod kit, will this work you think: http://www.ebay.co.uk/itm/ORIGINAL-X...8AAOSwLnBX8OJe
Thanks for all the help and that flasher link.
EDIT: Seller seems reliable so I bought the kit. Hopefully I can upgrade my other Xbox HDD and then I'll actually have a good working Xbox.