When you say textured do you mean separated into material zones according to the 3ds layers or  UV map textured? The distinction will make a significant impact on the model turn-around and the likelihood of finding a partner.

Another consideration, on models like the one in the first post do you expect conversion into an articulated poseable figure?(wheels rotate - turn, struts move, antennas track, etc)

If you are wanting to simply provide static props in OBJ format it would be easier and more cost effective to handle that on your end by also exporting the model in OBJ from your modeling program rather than converting from 3ds.

I hate to say it because your models are well done but at the prices they are selling for minus Renderosity's cut the percentage left to divide doesn't make it an attractive offer considering the work involved if you expect more than a simple static prop with material zones.