I used the green one satisfactorily
Yes, you can use either a new elastic band (to replace the loose one), or (for the upper chamber) a Noise Magic adapter (I use it inside an NSK3480 and works marvelously, but tlhere's some Scythe rails that works great).
Even right angle SATA connectors should help to save space and routing the cables neater.
These "Noise Magic" adapters sound interesting. I'm unable to find one through Google. Could you please paste a link to one of these?
Also, where can I get new elastic bands? From Antec? Generic bands?
Generic bands works: the looser, the better. A tight band is useul just for drive safety.
Now I'd like to know how are these short 650 Tis noisewise. Any ideas? Hope so. This is Silent PC Review
As far as I know, the only MSI which I know as really quiet is the 1Gb Ti Power Edition (with the Cyclone II cooler).
Judging from past recent cards, the MSI GTX-650Ti Boost 2GB TwinFrozr is (should be) more aggressive on load (how much personally I don't know, but given the moderately higher TDP it could be not very much, and you can correct this behaviour with Rivatuner and the likes), while it should probably be less quiet at idle (this latter condition, if it's really true, may require a BIOS modding).
Any other MSI card (of whichever flavour, GTX-650, 650Ti, 650Ti Boost) more probably that not doesn't worth to mention, acoustically-wise.
I also appreciate the DC-II cooler from ASUS, but more probably that not - I didn't checked - the relevant 650Ti version may not fit in a Solo (as the GTX660 DC-II barely fits, I have it inside a Solo, but without any bolted drive): at any rate, I havent' used any ASUS GK106 card up to now.
As said for MSI, I don't think any shorter cooler works as quiet as those ones: but again it's only my educated guess.
Eventually, as I already told you, I won't give up on selected AMD cards: I personally tested two XFX, the cheap HD7770 Dual Dissipation GHz Edition and the already quoted 7850 Black, and they worth to mention, acoustically-wise, for the conscious gamer (the 7850 was on a Linux machine, but the 7770 under Windows 7 is easily controllable using SpeedFan).