I'm a newbie to all this and received my solo2 a couple of days ago.
As Ferret says, it is down to personal choice.
I've gone with OpenVIX 3.x as this seems to be a good one for newbies to the scene. My wife likes it - which is the most important thing!
You'll need to setup an EPG like crossepg which comes pre-installed on the VIX image.
Will likely load Blackhole in a couple of weeks just to see if it is a better user experience etc.
Viewing one channels whilst recording another will be available on all images.
You need to realise that you will have to get hands dirty at some point by transferring files from your PC to the solo box via ftp.
You'll need a file transfer program like Dreambox Control Centre
You'll need to ftp the cam file to the satellite box and then google how to install it on the image you choose.
If you go for VIX 3.x, and need help, I'll try and help as much as I can.