cmos pspice
E-mail to Chartered Semiconductor, TSMC or UMCi or even some Indian foundries (if any on the Internet) for 0.18-µm CMOS models for digital, analog and RF. They usually reply in more than a week if slow or less than a day if fast. Their models are accurate to their processes only.
You can e-mail to Berkeley BSIM Group directed by Professor Hu. They can offer you some models which they think is accurate. Because it is a research group, not an industrial organisation, they might ask if you are looking for 1st order, 2nd order, or unified models or whatever models they have available.
You can also e-mail to Infineon and Philips for European CMOS models. They also very accurate too.
Added after 2 minutes:
STMicroelectronics too have their CMOS models. You can e-mail them as well.
Renesas Technology (Japan) and Samsung-Hyundai too have CMOS models.
Micron too has CMOS models.
E-mail them if you want.