just a warning- none of the formats you listed support multi-texturing, which is necessary for lightmapping. if you export to .x you will have 2 objects, one with the standard textures, and one with the lightmap data. then you have to load both objects, and ghost one of them to achieve the lightmap effect. this is very wasteful because you have 2x the amount of polygons onscreen at once.
you really should give Gile[s] another chance, it is by far the best solution for DBPro.
but either way, your game will look much better with a lightmapped level!
Go Go Gadget DBPRO!
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