I've just installed 'Windows Mobile Crossbow Most Beautiful Edition' on my XDA, Much better than the standard O2 Rom and pretty standard looking imo, has some nice extras thrown in but overall pretty clean. My IPL/SPL are identical to yours. Just use Shelltool and you'll be fine.
Dont worry if it doesnt work first time, it shouldnt cause any problems to just reflash it. Worse comes to worse you can always flash back to the O2 rom, although I wouldnt recommend it, Wizard Love rom is quite nice.
Find download links for Windows Mobile Crossbow Most Beautiful Edition and Wizard Love that they mention in the Shelltool thread, then you're set even if you have a mishap.