What seeds to buy?

"a great high and incredible yield"

Chronic - Serious seeds: pretty much any of Serious' line of 5 strains will make you happy - AK, White Russian, Chronic, Kali Mist, Bubblegum. Kali and bubblegum would be taller, best to strart wit the other 3. AK will stink, you'll need odor control for that strain. White Russian won't be too pleasant either. You might think about Chronic.

"With its indica background Chronic can produce up to 600 g/m2 without losing that connoisseur feeling."

I've read smoke reports where people say they like Chronic's high better than WW and other CC winners.

Endless Sky - Dr Greenthumb: 42-45 days flower, 4 1/2 of 5 potency (WW & AK would be 4/5), big yield. Obviously Greenthumbs most popular strain, among many great strains.

Skunkberry - PeakSeedsBC: easy to grow, tastey, happy stone. I really like it. Very very compact and still a large yielder. Put in 12/12 at 16" (4 colas) and finished at 26", loaded with huge juicy buds.

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"it needs to be a maximum of 70cm due to a height constraints."

If you're cloning the finish height is up to you, just figure out the stretch. You can train a tall plant to finish short with simple topping or LST. I've grown 8' sativas horizontal in a 42" high room.

If you're newish to growing and not comfortable with cloning try an autoflowering dwarf like Automatic AK47 or Lowryder #2.

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Think about getting a fem single for several different strains and keeping the strains you like for mothers.

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http://www.pickandmixseeds.co.uk/col...cannabis-seeds

http://www.cannabis-seeds-bank.co.uk/

http://www.drgreenthumb.com/cannabis...dsEntrance.htm

http://www.peakseedsbc.com/seeds.htm

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http://www.seedbankupdate.com/su.html

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k2, kushberry, white berry