As for rigs, I assume you mean an FT-847... it's a great satellite rig and what I have. (Because if you do mean an FT-857, you'd really need a second radio as it doesn't do full duplex.) You can find them used for $900-1100 dollars. Just keep in mind they are a decade or so old. But I love that you can shift them to 'Sat Mode' and they keep proper split band memories with sat labels. - I know a lot of guys that use the 910 or the 9100 and just swear by them. I've never seen one up close and seeing pictures I don't care for the layout, but that's a mustard or mayo issue.
I cover my opinion on antennas in another thread: http://www.eham.net/ehamforum/smf/index.php/topic,97415.0.html
But it all depends on what you want to do. I just think CP is overkill but if you have the budget and do want to go that far, keep in mind you need to have the switching in place to reverse between Left Hand and Right Hand polarity. That entails relays, phasing cables and all that. I believe K8YSE is the only one I know that has that elaborate of a setup. Some guys have Circular Polarity but not the switching and just leave it one direction. Problem with that is, on SO-50 it's just as much loss to have only LHCP when the bird is RHCP as it is when your antenna is horizontal while the bird is vertical. The bird rotates... you'll get fading as it turns 90 degrees out of phase with you. If you go CP and the bird goes to the east of you it may be RHCP and to the west it will be LHCP. (I think that's right. It also depends on other things) My point is, without the ability to switch between the two CP orientation, you might as well just be linear polarity... it's about the same amount difference.
I actually bought a CP UHF yagi that needed to be refurbished and when I found out the above, I said forget it. I also know some that bought CP antennas but sold them before ever putting them up. Because the sats today (with the exception of SO-50) just don't seem to be as susceptible to the circular polarity issues. With the Arrow you can rotate it yourself. With a longer yagi and a preamp, the polarity fading on SO-50 can likely be overcome. I think others have experimented with two yagis on each band, one in each polarity having them EQUALLY phased instead of out of phase to create circular polarity, but I've not heard if it makes that big of a difference.
My two trains of thought, depending on ones desires and budget... 1. TV rotor, small beams titled 15 degrees, maybe preamps, good coax. or 2. AZ-EL rotor, longer single polarity yagis, definitely preamps and good coax. I started out with number 1 without preamps and am going to number 2. In the meantime, I bought an Arrow and have been playing with an HT and toying with the idea of getting a small all mode radio to try the linear birds portable. It seems fun to operate both ways! - If you have $3000-4000 then I'd say definitely start at least with number 2. As for the 847 vs 9100 I'll let a 9100 weigh in on that.
Between this and the other thread, did you get any useful info? Anything get missed?
73, Kevin N4UFO