Arc, still up at 5.30am!
Sledge - I only recently got BS, and it is good but it is a very steep learning curve coming from other sims. Occasionally I'll manage to drop into Arc's server on a Wednesday and just practice, practice, crash, practice, whilst the others just get on with the mission in hand - I try to stay out of their way. (I may have overemphasised the practice - more crash, crash, practice, crash - but still enjoyable). The only downside is the start-up procedure is slow (realistic!), no just hopping in and setting off like in most sims. Only a real pain if you crash as often as I do.
I think A-10C is better, maybe just because it's newer, maybe because it's not a helicopter and thus easier to fly. I don't understand why more people haven't joined in the Thursday Flight Nights.
I've just checked currency conversions, and for $40 it's about what I paid, but cheaper than I could get it for now.