Many say that the onboard sound has become very good in the last few years and a sound card isn't needed. Creative's fiasco with poor driver/tech support and other dubious actions hasn't helped.
However there are some good options and depending on what you want to do such as Asus, etc. One compnayy that I really like is HT Omega. I don't know where to link for the UK nor do I know if you can purchase or if they fit your budget but here is a link for you to at least become familiar with their offerings:
Acer (Gateway/Emachine), HP all seem to be using Realtek HD 7.1 sound chips with HDMI. No real issues but make sure they're updated. So look for PCI or PCI-E (better) with Realtek HD 7.1 sound.
I haven't encountered any bad Creative drivers... using an X-Fi Titanium with Win7 ultimate and it's working perfectly; sounds amazing. Hard to not recommend.