Don't get sucked into using a substandard instructor/ school because they use a baron/ 310/ or anything else for that matter (I am not refering to any school listed in this thread). The aircraft that you did the CIR matters very little after 6 months but the quality (or lack thereof) of the training will stay with you for a long time.
This is particularly important these days as people seem to be getting airline interviews and sim checks with less and less experience and therefore less time to gain experience to make up for poor training. I have flown with many people in the simulator over the past few years who are about to have a sim check with airline x,y, or z and felt sorry for the poor bugger as it was clear they didn't have a chance due to poor scan TECHNIQUE and poor procedural knowledge or advice. You shudder at the amount of people that use old wives tales and gimmicks to fly approaches or holding patterns "because that's how my instructor told me" even though it's all written quite clearly in the AIP.
The problem is mostly due to instructors teaching CIR who only got their own ratings a year ago themselves and have not actually used the rating in a variety of different conditions.
For what it's worth, my advice is go to a school that can provide an instructor with significant IFR experience and well as a comprehensive sim syllabus. The synthetic trainer, if used properly will not only save you a fortune, but if it is a good one, teach you things you can't safely do in an aeroplane. Organisations like this are few and far between.
When you get a letter from QF/
VB/ JQ or anyone else telling you that you failed the sim ride you won't care about those 20 hrs in a B58 of C310 as opposed to a "girly" B76 or PA44! Good luck.