Which Audio Interface to sync Ableton and SP 404OG?

[cosmadrego]

I have problem with an audio interface choice. What it should have to get it fully working with SP 404OG? It's my first hardware like this and there's what I noticed so far:

It should be at least 2 channels interface, should has at least two line outputs and one input, MIDI I/O, but it has line cable inputs/outputs and SP's have RCAs. How to connect this two? Is there any RCA to line-in connectors?

Brand new KompleteA6 is too expensive for me, so I think I will be searching for somthing worn or low end. I found Tascam US-122L so far, but it's doesn't meet all the criteria (?). My LIMIT: ~120 EUR.

I would like to use SP as a controller and effect device in ableton, is it possible? I would like to connect devices like guitar, mic and synthetisers in near future too.

Please dazzle me or my head will explode from overload. If you can explain to me step by step what device should I get and why, it would be great.

I didn't found similar thread, sorry

I wanna use it like this guy: http://www.youtube.com/watch?v=3G6PQGQjqZE

[preqwal]

Brand new, the Alesis io4 is 129 Euro on Thomann.de. Has 4 inputs, so you can plug in extra bits other than your 404. Has midi too. That's probably the best you'll get in your price range.

You may be better off looking secondhand, maybe look at the Maudio fastrack or something