For c99 I'd go for female seeds version - I grew it this year and it was very nice, relaxing but still clear headed high. However my top tip is to actually go for grapefruit from female seeds instead. It's a daughter of c99 and an unnamed sativa and has, in my opinion, a better taste and high. Little more spaced out feeling, colours are enhanced etc but you can still get shit done
I've tried a few kushes but they're not really my thing. Indica wise I've enjoyed aurora indica from Nirvana and la confidential from DNA I think it was, along with the critical kush I've been buying on the street, but I'm more of a sativa guy. I'll probably earn the ire of a few here, but I find indica heavy strains much of a muchness - for me sativa is where the high comes from and indica the relaxation and stone and there is less variety of stone than there is of high (unless you get a proper hashy leg numbing smoke on, but then that's only good for sleep)
I smoke to help with anxiety and depression myself and mainly enjoy the less racy sativas and sativa dominant hybrids for that. C99, grapefruit, some phenos of blue dream and cheese crosses have all been good for that.
I think you have a good plan regarding a heavy indica and a workable sativa. You can even mix them in a salad joint to get the hybrid feel. Depending on how many plants you're going for, I'd encourage a few of each type - say you want 4 plants, I'd do two different sativa dominant and two indica dominant. That way you have a variety of smokes, each on its own plus mixed joints or bowls which will allow you to figure out what works and what doesn't.
Sorry this is a bit rambly but my four would probably be
Grapefruit - female seeds (sativa)
Aurora indica - nirvana (indica)
LA confidential - DNA (indica)
Blue cheese - dinafem (hybrid but good for stress)
Blue hash - dinafem I think (indica) got me through some stressful times that one did.
These are all strains I've grown and enjoyed, I don't want to comment on shit I haven't smoked but based on the fact you smoke for similar reasons to me, I thought I'd give you an idea of whats worked for me.
Ganja gu brah