I have a i3 sp3, and I don't carry a ton of files with me, music files at 11 GB, and my office files amount to around 4 GB. The neat thing about the sp3 is the ability to use the USB3 port for storage. I bought a adaptor for using SSD drives that works great. I know SSD drives are alil expensive, but, here in the US prices are dropping. Also USB key drives are pretty cheap to buy.Don't presume that your requirements re universal.
If not for onboard storage, i'd be royally stuffed. I don't have any ability to use cloud services (and even when i have broadband, upload speeds in the UK are so abysmal for the vast majority that we still don't bother with cloud storage) and this is a mobile device. where is the sense in me spending money on something mobile if i have to cart around a bag of external harddrives in order to use it as i wish?