If you have 100 bucks to spend, I'd recommend getting a less expensive (but good) knife and spending the rest on a diamond taper, honing stone, some lube, and some metal protectant. It is better to have a sharp, rust-free, smoothly-opening knife than a slightly more expensive but uncared for one. Knife care is very important (especially if your knife is going to be on EDC duty) and something you should learn ASAP.
I am sure the Sharpmaker is great, but I think you should learn how to sharpen knives yourself. It is very easy and will save you money versus buying a sharpmaker. I know sharpening systems are very quick and easy, but I think you should learn to sharpen yourself first, and then decide on whether you want to use a sharpening system once you have that skill.
If you disagree, then get the Sharpmaker. Either way, do get something to keep your knife sharp.
Some good EDC knives for under 100 bucks are:
Spyderco Native, Delica, Endura, Salts
Kershaw Leek (especially the new G10/S30V model)
Benchmade Griptilian, Mini-Griptilian
These each have pros and cons, but are all tough, good knives. If you want the best steel, the S30V Native and S30V Leek offer the best steel. But the Delica and Endura offer VG-10, which is VERY close behind. The Salt-series has H1 steel, which is good and rust proof, but not as hard as VG-10 or S30V. But H1 is great if you plan on getting your knife wet a lot. The Griptilians are 440C, which is good but not top of the line. There is also an S30V version (Rittergrip) and a D2 version (Cabelas), but they are more expensive, and IMO, not worth it for EDC unless you really use your knife a lot. I am a big S30V fan, but the 440C Grips are just a better value, IMO, especially for general EDC chores. If the D2 and S30V versions were cheaper or offered a better handle material, I would think they were worth it, but as is, I feel there are better knives for the money. The Leek offers assisted opening, which is fun. It will also offer S30V and G10 scales (which should feel much higher quality than the FRN of the Spydercos and Grips).