Correct, if you don't plan on overclocking and aren't worried about your CPU temperature while running stock speeds, the Newcastle core is the better choice, but the Winchester core is a much better core and will be far more energy efficent, achieve high clock speeds, and dissipate less heat all at the same time.
I think a 3500+ Winchester can overclock up to 2.6Ghz without any voltage tweaking.
Intel C2D E6320 / AMD Athlon X2 3800+
Gigabyte 965P DS3 / DFI nF4 Ultra-D
2GB OCZ Gold PC2-6400 / 2GB OCZ Gold PC4000
eVGA 8800GTS 320MB / eVGA 6800GS 256MB
150GB Raptor / 74GB Raptor
2x500GB / 320GB
OCZ GameXStreme 850w / OCZ StealthXStream 600w