assorted pickandmixseeds for a 600W indoor

This is going to be my first grow. But I did loads of research and plan on making it a bit complicated:

Vegging with a 600MH Diamond reflector
Flowering with a 600HPS and maybe add the 600MH. (I am considering to order all equipment now and get two ballasts so I can add the MH in the last weeks to just hang vertically down between plants.)
Room is 5'x4' some 6' high.
Soil with BioBizz

Seeds will be from Cannabis Seeds - Pick 'n' Mix Cannabis Seeds/ , so I might as well get plenty of different ones.

The idea is to germinate and veg them together but gradually harvest them during flowering to let the longer flowering flower and have the space.
So I thought to get some autoflowering strains (because I have absolutely nothing left to smoke now) and then some classic indicas and sativas.

I have no idea what I am talking about but it would be cool to use all space+light. So I fantasize:

Start with some 30 plants if regular or 15 if feminized.

When they are small the 600W should be enough. Veg for 4 weeks 20/4 as a compromise for the automatics. Then after two weeks of flowering the Low Ryder will be smoked and so the others will have more space. Then I'll harvest the indicas and let just 1-4 sativas grow to 4'-5' with 4 colas like Uncle Ben (Uncle Ben's Topping Technique to get 2 or 4 MAIN colas - Marijuana Growing). (The indicas and LRs will be untouched/natural.)

Now I understand the key would be right strains and timing. Both things I newbie know nothing about.

Below my preliminary selection of seeds. Favorites are Night Shade, LR2 and SLH. Please share your thoughts!

Strains considered:

Sativa

Super Lemon Haze 3x7.5EUR (60-70days)
Hawaiian Snow 9EUR (80 days)
Arjan's Ultra Haze #2 7EUR (80 days)
Utopia Haze EUR8 (90cm 80days)
G13 Haze 10euro 70-80 cm/days both
WW sedsman 2.50 euro

Indica

NightShade 4x 7EUR (55cm 65-75days)
LSD 1x7EUR (60cm 65days)
Blueberry 13EUR (55-70)

Hybrids
A.M.S. 3.50, 8-9 weeks
Big Bud 11euro (110-150cm 50-65days)
Big Bang 3uro 9weeks
Jorges Diamonds #1 12euro 60 days

Auto

Low Ryder #2 11EUR
Low Ryder #2 & AK47 11EURO hybrid
White Dwarf 9Euro indica
40cm 60 days