The card of choice would be the 1Gb option as both cards use the same chip-set, but unless you change your monitor to something better you are not going to get any benefit from it sticking to this lower resolution. Pick the bigger card and change the monitor as soon as you can and get the best out of both.
Hi mate as adrian stated at lower resolutions both cards will run well however the 1gb version is prefered if your running games above 1280x1024..... however im running games at 1920x1080 using a 512mb card (gts250) and I experience no problems so with a maximum resolution of 1024x768 I wouldnt even bother with the 1gb card... its wasted money unless you plan to buy a 22" monitor in the future ...... and to be honest you won't get the best out of either card with a maximum resolution of 1024x768....... ( I presume you have a 15" monitor with a max resolution like that ) however one advantage of running games at lower resolutions is better frame rates.... with the HD5670 you will be looking at excellent frame rates on allmost every game.... and around 45fps in crysis 2 with those specs I hope this helps good luck mate!
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