you could always pick up an old road bike, lots around with six speed and 27" wheels in my area from $50 on up. stick with at least six speed because it will have 126 or 128mm rear drop out spacing. 126 can be upgraded to 7 speed and 128 can can handle 130mm rear axles which will allow the use of 7,8,9,10 cassettes, should you want to go that route. here's my 7 speed puch with flat bars. even with the flat bars it is faster than my hybrid over my 15 miles loop.