inexpensive soundcard for output only?

I don't know of any pro audio soundcards that are output only, but in your price range you could get an Echo Mia (I've seen them on ebay for as low as $60 because it's been discontinued). 5ms latency, according to this review in Sound on Sound. And Echo uses some of the best A/D D/A converters in the biz. Just ask anyone who uses a Layla which, I think, has the same chips.

I dont want to be dependant on the external component for the ouputs. I wont be using that midi/audio for everything or always have it when i need the output.

ORIGINAL: Beagle

you will have problems trying to use both an internal and an external, tho, because of the different clocks and drivers. you could loose track sync and you will have horrible latency trying to use the one card for input and another card for output.

The M-Audio Delta 1010 has wordclock I/O... would that take care of the problem (provided that the usb interface also has wordclock)?

Sorry to say your reasoning is a little wrong.
audio IO is not expandabe by just getting more devices and somehow magically making them, all work together with a "clock"
Just having a clock will not solve the major problem of drivers from 2 or more different companies for 2 different devices. It will also limit you to using WDM drivers only as ASIO drivers will not allow you to run more than the one device. The only time this is not the case is when the driver is specifically written to allow multiple similar devices from the same manufacturer to run together. Like multiple M-Audio delta, RME FF800's etc. The drivers are written to allow multiple device to be seen byt the PC and SONAR. They are all typically firewire or PCI devices not USB.