I'll try to put some of the ideas so far (and from the least to the most dramatic-ish)...
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1) Leave GS alone.
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2ai) Move GS research to Garrison.
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2aii) Move GS research to Garrison, reduce research cost to $7.5k.
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2bi) Move GS research to Garrison and give GS AC unless they have dependent Starbase, in which case GS can also have SC, reduce research cost to $5k.
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2bii) Move GS research to Garrison and give GS AC unless they have dependent SY, in which case GS can also have SC, reduce research cost to $2.5k.
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2ci) Move GS to SY and gain tech when SY is built.
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2cii) Make GS a Bios only ship and move GS to SY and gain tech when SY is built.
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2d) Move GS research to Garrison and dependent on techbase or a starbase, reduce cost to $5k.
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3) Have a Lt (in garrison) and Hvy (in starbase) GS, research cost of both at $5k. Lt similar to current though with mini-SC, Hvy similar to a bbr -> hvy bbr.
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4) Move GS research to Garrison and dependent on techbase or a starbase, perk hull and signature ~25%
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Other Suggestions
A) Change pilot mini-AC to dual gatts (exception?! for Rix? (TF?)).

Change (lower) GS rip time to that of a bomber.
Ci) Lower GS ship cost to $50 per.
Cii) Lower GS cost to $1 per.
Ciii) Increase GS cost to $500 per. (presumably if GS are effectively perked)
D) Give GS mini-SC (combined perhaps with moving them to Garrison and (?) reduce research cost).
E) Tie GS access to LRM (& killer) to dependency on Tac.
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Now is that about the main ideas, if so we can start narrowing it down so we can get a forum poll on what general direction to go and narrow it down even more.