I tested a number of convertibles under $35K before buying the Z4 but none came close to the value and performance of the BMW. The Z4, even with the smaller 2.5 liter engine, is an impressive performer. It has a strong power curve in gears 3-5 and plenty of torque in 1st and 2nd. The Z4 is plenty fast, but if you want to run with the big boys, get the 3.0 liter and the six speed. The cornering and handling is very good but a notch below more serious sports cars like the Boxster. You will fall in love with the sound of the exhaust. My only complaint is the noticeable electronic steering assist at low speed. You can buy a one year old low mileage Z4 fully loaded for the low $30s!
Power top, self dimming mirrors, Xenon headlights and a stereo whose volume increases with the speed of the car. What a hoot! Very comfortable seating with height adjustment for short people!