Matching Pre-Amp to Amp

I have a pair of McIntosh MC 601's and my CJ pre-amp is malfunctioning (I do plan to send it for repair, but it's 20 years old). I'm debating buying a newer pre-amp. Any suggestions as to an appropriate pairing with an eye to value (the law of diminishing returns sets in and my resources are not unlimited)?

Thanks for any and all intelligent and reasonable responses.