The same you recommend. Armory. You backup your deterministic wallet once and that's it. You can crate and use a ton of addresses and the backup is good for all of them. Armory lays focus on backups. The new version has M of N backups and printer safe paper backup. Just easily create 5 backup printouts and any e.g. 3 will be good to restore your wallet. And even if somebody manages to get hold of you printer memory they can not spend the coins with printer safe backups. When Alan is back from his honeymoon the guys will wrap up this version. There seems to be one more bug to be fixed before they can make the release official. My BF Address is an Armory Address and I feel very very comfortable with this. Alan just got a 600k Investment for Armory Development. As there isn't really a concrete buissness model yet, it is more like a 600k donation. They might be offering enterprise solutions once and make some money with support contracts and even more advanced features and such.