I used an openbox v8 for a while then switched to IPTV so i could get HD channels and the ability to record.
Currently i have a subscription to iviewHD which is great and works well. I have however noticed over the last couple of months that ISP's are starting to throttle traffic when there are live events on (F1/football/boxing) so there are lots of complaints about it at the moment.
I am personally on VM 200mb and haven't noticed the throttling myself but i can see lots of people complaining on the facebook support group whilst using other UK ISP's.
I am looking to move over to a VM box soon so i can get true HD channels (iview is good but the pic quality inst quite proper HD, you can tell its a HD stream if that makes sense) and the ability to record.
If you do end up going down the IPTV route then i would highly recommend an amazon fire tv (not the stick) as its very fast with a good pic quality along with a sub to IviewHD which will cost around £90 for a year.
TOP TIP, if you can hang on, they go on sale every so often so i picked mine up for £55 ;-)
Good luck :-)