I tried one from ebay but for some reason it wouldn't work with my nunchuck and disconnects occasionally in Wii Sports Resort (have to recalibrate). Mine was like ~$6 CAD from China.
The HDD with 50 games already saves you a lot of time "downloading" them, plus since it's softmodded you don't need to worry about hacking it.
If you don't use your camera a lot then I would consider the trade.
Your camera is around $300 with the added stuff probably around $340. The Wii softmodded with 120GB HDD with a mic would probably be worth around $270. Thats just my guess....
Should be it... I can try it on Saturday for you if you want. PM me.
It will include your Hunter ID / Customer ID too I think but you can use the Wii Backup Disc to change that (but you lose your friends list).