when it comes to 303 emulations - check D16's Phoscyon - much better than Audiorealism bassline imho..as for controler my fav is novation's remote - this comes with faders,pads and knobs and keyboard. they also made a nonkeyboard version - remote sl zero. there's a new version on market now and it's more ableton friendly > http://www.novationmusic.com/product.../zero_sl_mk_ii
check it, it's really worth money u pay for it. if u don't wnat ot a new one, check ebay for second hand item.cheers!