Turian ghost is also a good choice. But yeah, I did with it with the kroguard. You definitely want geth as the faction. As for map, I'm not sure. I did mine on Jade and Goddess to kind of speed things up.
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I've solo'd Reapers on gold a number of times, IMO much better experience than Geth. Sure the Geth have no sync kill enemies but, Banshee's and Brutes are the only ones who can sync kill and they're absurdly easy to avoid. Also you don't have to worry about being stun locked the entire match. Just my opinion as everyone seems to recommend the Geth.
I think the Geth are only advised if you're playing the Krogan Vanguard, simply because of Biotic Charge.
On the subject of Gold solo though, can someone give me some tips for the 4x hack objectives. I've tried to solo Gold about 5 times and have literally had this come up at wave 3 every time. I've tried leading the enemies away, but it never seems to work and I end up getting downed a lot.
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All you can really do is get as far away from the point as possible and wait for the enemies to come to you. Then run like crazy to the point and hope. It is definitely the hardest objective to do solo. TGI with duration cloak makes it easier.
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