I'm looking for recommendations for a roofer, general contractor, handy man, electrician, plumber, painter, carpenter, and cabinet supplier.

It seems like it might be best to find that middle 'sweet spot' and go with the median level of finish then in your case (sounds like not wanting to invest a lot to update, and want to keep cash flow at max.)If I were to run comps and see on the high end of area rentals it meant all new countertops, appliances (high end), hard wood/laminate, kitchen cabinets etc and on the low end it meant more of an 'apartment level' finish - I personally would go for the middle road to this and maybe choose to refinish countertops, refinish kitchen cabinets and go strictly mid-range on appliances (I would pick up the extend warranties personally).In hitting the kitchen and baths, getting some fresh paint up and addressing flooring- I would know the heavy 'where the eyes are drawn to' items were checked off my list, take it all for expenses come tax time and be pretty happy to know I was right in the middle zone for the area- I wouldn't have the lowest quality of renter pool in the area, or be worried about overpricing myself out of the competition on the high end in my mind. 

I replaced kitchen cabinets myself and refinished hardwood floors.

Added tile to kitchen floor and painted kitchen cabinets.

The lower portion of the house is tiny, and there is this antiquated in wall TV cabinet that I want to get rid of.

I am adding basic grade stainless steel fridge, standard washer / dryer, and possibly sand/paint cabinets to update it a little.

Trying to find nice looking, but also affordable & durable cabinets. 

Remember anything more than flooring, sheetrock repairs, cabinets and a few little repairs you will need to level up to a licensed contractor.

This is my first time and I'm trying to figure out the best place to buy kitchen cabinets if anyone has any recommendations?

I do only rental rehabs taking a 1975+ split level 3/2 and just causemetic;  paint, fixtures, flooring, new HVAC, rarely a roof, never windows,  paint the kitchen cabinets with new hardware, clean up baths, just clean up landscaping, fix things beyond replacing all ceiling and plumbing fixtures (except shower valves) and this has grown to $25k is now tight