I don't think anyone has mentioned this, but you don't necessarily need an outboard phono preamp. You could use a step up between the turntable and McIntosh preamp. This could be an active head unit or step up transformers. The cheapest path would probably be to try a Moving Magnet cartridge. I don't know what would go good with your arm, but Grado and Audio Technica make good entry level MM cartridges.
Ben
Ben