For the Not so cheap option, which I'm considering, you could buy a Soundblaster Audigy Platinum (I think it's called that) package not only does the Drive have a 5.5mm input but it also comes with a copy of Cubase in the software bundle.
Note at £150+ it may not be a viable thing for everyone, but certainly worth a look
try
www.europe.creative.com
See for yourself
Yeah forgot to put the disclaimer, Duh!
I Haven't tried This Soundcard YET!!! and I am in no way affiliated to the company that made it
So check it out for yourself before you buy