If you do actually have an iPad, rather than an Android tablet of some description, then Apt-X Bluetooth is a non-starter as Apple products don't support this higher quality Bluetooth.
For iPads, Bluetooth isn't the best option as it'll be heavily compressed. If you're determined to have a wireless option and your network is up to scratch, then an Apple Airport Express or older generation Apple TV (the one with the optical output, but then you'd need a DAC too) would be ok. But personally I found Airplay to be patchy with regular dropouts, despite high-MB Virgin Media broadband.
What precisely do you intend to stream? Is it downloaded songs actually stored on your iPad, or is it from Spotify? If it's Spotify, then other options that support Spotify Connect might be worth considering. Also, how close is your router to your hifi? Where possible a wired ethernet connection using your iPad purely as a remote, rather than the streamer itself will offer better results. I found the best option for me (until I can purchase a dedicated streamer that does the job) is to physically tether my iPad to my AV receiver. No dropouts or hitches of any description and no compression.
Google Chromecast might do the job, particularly with the ethernet adaptor, but I've read very mixed reviews and have no personal experience with it. Some people rave about it with no problems at all and others seem to be unable to get it working properly.