Okay listen up pal. You do not want to hardmod(get a modschip).You see, getting a chip and someone to install it costs money. Thats the first thing. Second thing, you said you want to use it for modding and play games from USB drives. BOOM! Another downside of hardmodding and upside of softmodding.
And lastly, if nintendo makes a brick-update(update which doesn't get any new changes, it's just here to remove softmods and/or hardmods) you wont be able to:
1. Restore your Wii if Nintendo patches wode
2. Update safely using WiiHacks.
So in conclusion:
Modchips: Play backup games.
Softmodding: Phew. Play backup games, play games of USBs and HDDs,the homebrew use the homewbrew channel(whick should be important if you plan to use your Wii for modding), and a lot of other things.
So, if i convinced you, head over to Mauifrogs softmod any wii guide, head here: http://www.wiihacks.com/recommended-...d-any-wii.html
If not, good luck on hard modding, and if you change your mind, i suggest using WiiKey v2.