look at this:
http://www.bay12games.com/forum/index.php?topic=37294.0
Seems to have everything you want except lots of trees, but it does have the ability for tower cap logs so you could just rush to get those farms started. Also it's a 5x5 embark so maybe a little faster than 6x6?
Yeah, theres also this 4x4...
World Gen Parameters (When asked, hit "p" to ignore all rejects):[WORLD_GEN]
[TITLE:NEW]
[SEED:3072787075]
[HISTORY_SEED:3629570892]
[NAME_SEED:1364375378]
[DIM:65:65]
[END_YEAR:10]
[BEAST_END_YEAR:512:90]
[REVEAL_ALL_HISTORY:1]
[CULL_HISTORICAL_FIGURES:0]
[ELEVATION:1:400:1600:1600]
[RAINFALL:0:100:1600:1600]
[TEMPERATURE:25:75:1600:1600]
[DRAINAGE:0:100:1600:1600]
[VOLCANISM:0:100:1600:1600]
[SAVAGERY:0:100:1600:1600]
[ELEVATION_FREQUENCY:1:1:5000:5000:1:2500]
[RAIN_FREQUENCY:1:1:1:1:1:1]
[DRAINAGE_FREQUENCY:1:1:1:1:1:1]
[TEMPERATURE_FREQUENCY:1:1:1:1:1:1]
[SAVAGERY_FREQUENCY:1:1:1:1:1:10000]
[VOLCANISM_FREQUENCY:1:1:1:1:1:10000]
[GOOD_SQ_COUNTS:6:63:127]
[EVIL_SQ_COUNTS:100:250:500]
[PEAK_NUMBER_MIN:1]
[OCEAN_EDGE_MIN:0]
[VOLCANO_MIN:200]
[REGION_COUNTS:SWAMP:66:0:0]
[REGION_COUNTS:DESERT:66:0:0]
[REGION_COUNTS:FOREST:264:0:0]
[REGION_COUNTS:MOUNTAINS:528:0:0]
[REGION_COUNTS:OCEAN:528:0:0]
[REGION_COUNTS:GLACIER:0:0:0]
[REGION_COUNTS:TUNDRA:0:0:0]
[REGION_COUNTS:GRASSLAND:528:0:0]
[REGION_COUNTS:HILLS:528:0:0]
[EROSION_CYCLE_COUNT:275]
[RIVER_MINS:800:800]
[PERIODICALLY_ERODE_EXTREMES:1]
[OROGRAPHIC_PRECIPITATION:1]
[SUBREGION_MAX:5000]
[CAVE_MIN_SIZE:5]
[CAVE_MAX_SIZE:25]
[MOUNTAIN_CAVE_MIN:6]
[NON_MOUNTAIN_CAVE_MIN:12]
[ALL_CAVES_VISIBLE:0]
[SHOW_EMBARK_RIVER:2]
[SHOW_EMBARK_POOL:2]
[SHOW_EMBARK_M_POOL:2]
[SHOW_EMBARK_M_PIPE:2]
[SHOW_EMBARK_CHASM:2]
[SHOW_EMBARK_PIT:2]
[SHOW_EMBARK_OTHER:2]
[SHOW_EMBARK_TUNNEL:2]
[TOTAL_CIV_NUMBER:35]
[TOTAL_CIV_POPULATION:-1]
[PLAYABLE_CIVILIZATION_REQUIRED:1]
[ELEVATION_RANGES:528:1056:528]
[RAIN_RANGES:528:1056:528]
[DRAINAGE_RANGES:528:1056:528]
[SAVAGERY_RANGES:528:1056:528]
[VOLCANISM_RANGES:528:1056:528]
It has some nice plateau's with enough trees to get you started though the 90 z-levels might be a tad processor heavy
Features: Flux, aquifer, river, underground river, underground pool, magma pool, magma pipe, chasm, hfs, and a small patch of sand.