I like Kodak so guess what brand I will talk about? If you want to go really slow in color negative there is Ektar 100, Portra 160 (in either NC or VC) I recommend 160NC to start out, there is also Kodak Gold 200 that you can find on the shelf in CVS Pharmacies. let me just tell you that you are lucky that your local Kmart even has film because where I live It is either CVS for Kodak, or Rite Aid for Fuji and my local camera shops are WAY overpriced. If you have a negative scanner, most Pharmacies with a minilab will process (and scratch) the film for you for quite a small fee. It does not give the best idea of what you are doing, but the results will be passable. All films shoot a little different from each other, and you will have to find the one that you like best for what you want to shoot so plan on shooting a lot of film, and keeping several different kinds around so you have what you want when you need it.
Here is something that few people will tell you when you start shooting a lot of film. Learn to read a negative and use that to learn how to adjust your camera for proper exposure before spending a lot of money on slide film. Minilabs that print photos and Scanners lie and will only inflate your ego, You should in the middle of a roll of film (so the young lady that works the minilab doesn't cut it off and toss it) intensionally overexpose and underexpose some shots so you can see what they look like on the negative. this is not wasting film, it is sacrificing a few frames so that others may have a better chance. Overexposed will produce a dark negative, underexposed a light looking negative, but I will bet you that the scanned or printed photos of those frames will look like all the other frames on the roll trust me, it is better to find this out with negative film that can be saved in the print process than slide film. Knowing this will help you figure out what you are doing wrong when you expose incorrectly and the color looks "a little funny".
Question: Not to sound rude but I am wondering what the problem is so I can avoid it.
You can't shoot 400 in daylight? Are you shooting the sun directly? I shoot 400 in daylight a lot with a Kodak Brownie that has 4 apertures ranging from 64 to 16 and two speeds, 1/50 and 1/25 and it sucks, but i can do it, my Pentax 6X7 only goes to 1/1000 and I have shot that at f/2.8 in mid day sun as well. What are you trying to do that 400 is too fast for?