Carefully trimmed and with minor upgrades, the ARF Flite Streak is a potent contender around here. At the Palmer Memorial contest, Stan Tyler walked off with the BARF (Best ARF) award with a 507point flight in Profile 40 - Competitor. He has won the event in the past with the same plane. Mine with a Saito 30 was a real delight to fly. Dirty Dan has the combo worked out to a readily reproduced perfection.
One major modification that will drastically improve the flight characteristics is to go to a much larger, high aspect ratio tail. We add about 4" span to the stabilizer, keeping the same look, and 1/2" chord to the elevator. The model can now be tuned to turn very tight without any exit bobble. The nickname for this is the Doodle Streak, since Bill Netzband suggested that high aspect ratio empennage with a low aspect ratio wing is a good thing for unflapped models (A technique he uses in his Doodle Bug design, thus the name). He even gave me the correct area to use.
On my Saito model, I shortened the nose about 1.5" and put a plastic clunk tank housing on the inside of the nose. I didn't use the usual plumbing, I used a floppy balloon. Never a worry about air bubbles or foaming with that system, and the fuel "head" generated by centrifugal (centripital? I never can get that straight) force provides reliable fuel draw in spades. In fact, it results in what I call a 4/4 break. The engine is set full lean on the ground, and goes slightly rich in the air. When you go into a maneuver, and especially overhead, the power comes on strong.