Except for my most heartfelt sympathies I can only offer this advice: Remember your experience well and don't buy Steinberg software.
I think that's a bit of a blanket statement - all Steinberg software is not bad IMO.. while I wouldn't touch Halion with a 10-foot pole, I rely on Cubase and find it quite usable and stable.
I definately agree on the avoid the VI version sentiment. The Halion player has given users problems not only with "True Strike" but also with stuff like "Broadway Big Band". You're a lot better off getting the current multi-format and loading it into your sampler.
Maybe ask Maarten (from ProjectSAM) if they're willing to replace your Halion-version with the Giga 1.5 version, which you can then easily open in Logic's EXS. With a relatively simple library like this, the conversion from Giga to EXS is faultless. And TrueStrike1 in EXS works perfect.
the latest Strike installer should give you a choice between several formats.
i found the Kontakt version to be the most versatile.
Maybe you can upgrade the installer. the samples are the same its just the programs
Regarding the stability of Halion on a Mac i also had nothing but bad excperiences.
Its superslow and very unstable at least on my G5.(plenty of ram and HD)