From provided frequency range seems that you are looking for a VCO, part of a direct up-conversion transmitter for GSM900 and DCS1800. If is a direct up-conversion, you need a VCO with a low wide-band noise, to don’t use very special TX filters.
Whatever topology you use, the quality factor of the resonant circuit is important, this including: Q of the resonator, series resistance of capacitors, series resistance of the tuning diode, the loss of printed circuit board, etc. Generally Colpitts is the most used for this kind of application.