Helmet - Try them on and buy what fits best... HJC fits me best of any I tried.
Boots - I'd want something with more ankle support. Check out the Field Armor Boots... They are comfortable to walk around it, don't look too crazy, and I've crash tested them.
Gloves - If you're like me, it's going to be hard to find gloves that fit you. I have wide hands and short skinny fingers. I always have an extra 1/4" or so at the ends of the fingers. A* SMX Air-2 Carbons are the best fitting gloves I have ever found (my entire life). The A* GP Plus gloves I have now fit ok, but still have the extra in the fingers problem. Try on the ones you like the look of the best and go from there. Recognize though that pretty much all gloves are going to be uncomfortable until broken in, so you're just looking for fit.
Jackets - Meshies are good for hot weather, but don't hold up the best in crashes. Textile is more durable, but is also hotter. Leather is best and from what I understand, perforated leather is reasonably cool.
Pants - Demin sucks. If you go that route, buy overpants. You get armor and much better abrasion resistance...
My gear list includes: Alpinestars GP Plus gloves, Icon Field Armor Boots, Knox Ricochet back protector, FirstGear V Mesh jacket, FirstGear Tex Mesh pants, and HJC AC-12 helmet.