Most of what you've posted is fine .There are other assorted kits available including regulators ,Tantalum cap,monolithic caps and CD4000 series chips .I've not had any bad experiences with any micro chips on Ebay. Picked up a pack of 12 NE555 and they all work fine .Recently I've shifted to the TLC555 because they can go up to 2Mhz and are much more stable at the higher frequencies I've been working with.
The ceramics are Ok but are really out of spec.At least my are.Some as high as 50% out. Electrolytic s I get as I need them because i find most of the kits never get used.The kits are alright but the voltages are to low for my needs.But you might do OK with them.The Thetas are are usually around -89 to - 95 which is quite good.
But if your still interested some really good capacitor kits can be found here
https://www.justradios.com/ they're more expensive but are really good quality.They're not used but brand new parts with a very wide range of values .An example in price is say 200 Orange Dip Film Capacitors at 630 Volts (5 each of all 40 sizes) $69.99. You may not need such high voltages but it's an option .Or you can get which ever individual ones you need . They have resistor kits but you probably be better off with the Chinese ones .It's likely you don't want or need to many carbon composite resistors. The only problem I have with the Chinese resistor kits is I find myself having to fill the gaps in values and to many values I probably will never use.
Go with the 1 watt zeners for sure as T3sl4co1l suggested.
If you what to experiment with Mosfets the irf3205 is a decent one at 55V 110A and a low RDS (8mOhms). They're popular and fairly inexpensive .
If I need a newer chip then I use Digikey , but most of the usual chips off Ebay are just as good. I tend to get a little abusive with chips some times and they stand up pretty well.
If you need transformers
http://www.antekinc.com/ has really good stuff in the toroid.Very well built products.
Theirs lots of online electronic stores though out North America that are really good.And are really helpful when you have problem deciding on a component for a specific application.
Anyway good luck