don't know blue dream (can you say somethin' about the lineage?)
but i can suggest you some high-quality sativas with great yields and short flowering times also:
-Grapefruit (Femaleseeds) - 75% (the legendary) C99 and 25% (unnamed) tropical sativa... great high/taste/yields!!!
-x-line Fast Nevilles (Femaleseeds) - the legendary Nevilles Haze backcrossed for short flowering time... (just ordered them,can't wait to grow dem treez)!!
-Satori (Mandala Seeds) - a great sativa dominant hybrid with nepalese genetics... great aromas and yields + very strong up-high! low nutrient uptake.
-Killing Fields (Sannie's Seeds) - ok this one needs a lil bit more flowering period but less veg instead and equals with more yields. she has some superb genetics inherited: Blueberry Sativa/C99/G-13/NYCD/Jack Herer... (waiting in the refrigerator/can't wait to pop dem ladiez, yeah). Got also Chocolate Rain, which was sold out after i'd ordered a reg. 10pack, sorry
and Hericules, which is very strong but has more indica in it: Herijuana! this one could be a good contrast to Sativas and a good night-time smoke
-AK47 or Kali Mist from Serious Seeds! and Arjan's Ultra Haze #1 were really great as well! (even though the UH#1 and Kali Mist needs longer flowering period. the trick is simply to clone enough ladies and send them into flowering right after the roots have started to establish in the substrate. Sativas don't need vegging, they tend to grow on and stretch in the flowering period for at least a month. clones usually trigger flowering faster/sooner because they are aged/have been in veg. long enough. and when sativas stretch 2much my advice is suppercropping and using a net to support the heavy bud structures...)
good luck wit dem treez.