I can't speak from personal experience on the swift, i've never even seen one in person. It does look to be a decent bird though if you put a good setup on it. Theres a review of it here on RCU if you want a more in-depth look at it.
Your investment in the swift and logo 10 will probably be pretty close, so i'd just choose whichever appeals more to you.
I like my eco-8 quite a bit, but it's an old design. It's a good deal bigger than the mini helis like the T-rex and X-400 though. Perhaps the new Eco-8 Royal thats due out soon will do much to re-vitalize the design. It's an inexpensive bigger electric helicopter, which is it's strongest point. I fly it on 10 cell sub-c packs and it flies great. Because ikarus is phasing out the original eco-8 to be replaced by the eco-8 royal (well, it seems that way, anyways) prices on the eco-8 kits are dropping quite a bit.
Ikarus parts are a little harder to get than Mikado parts, although none of them are what i'd call widespread availability like the t-rex or raptor helicopters. QOJ parts are very scarce from what i've seen. Century birds have a good deal of support in terms of parts, so that would be a safe bet if you're prone to crashing

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I use helihobby and fxaeromodels for my eco-8 needs. I'll buy anything else I need for my micro helis on ebay most of the time.
Personally, i'm waiting on the T-rex 600, i'm going to sell my eco-8 soon and use the funds to buy the 600 kit. Bout time I stepped up to something even bigger, I think

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