Knive Set

Cake Decorating supply suggestions. Can you give some advice please?
I'd like to think I know my way around a cake. Ive always purchased the cheap 6 dollar cake decorating tip set from wal mart, grocery stores, dollar stores etc. I want to upgrade a bit, when it comes to my cake decorations. I'm interested in purchasing the Wilton 101 piece set.
http://www.target.com/Wilton-101-pc-Decorating-Tool-Blue-Caddy/dp/B000EN6CJ6
Im not sure if thats all I'll need, or if Im gonna want to buy (or need) more tips. I also want to know if it's even worth buying, will I NEED everything in it? Will I need more items? Im used to leveling the cake with a plain o butcher knive, and its always came out fine, Im also used to just having about 4-6 tips to decorate with. I want to step it up a notch, but just want to know if its actually worth it or not. Any suggestions would be great.
Thanks In advance =)
I purchased a smaller set of tips many years ago from Wilton and found I basically use maybe 4-6 tips to decorate. I don't think you need all those tips. You can sure do a lot with a few tips.
Hope that helps.
Winchester knife set
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