The only mAudio card with more than 4 inputs is the 1814 which is $995 in Sg. The 410 with 4 inputs is $595 and if you are in the digital domain you can use the SPDIF input to squeze a bit more out of it.
Why are you set on M audio? It's nice looking but the drivers are notoriously bad and it's known to integrate into some programmes better than others, check the Sonar discussion board to read comments from a whole bunch of unhappy customers.
If you need 6 analogue inputs you could check out products from Presonus, Mackie and MOTU (yum yum) but none of them are targeted at users 'on a budget'