ARC LS25 or SFL2 preamp

It's time to upgrade again and I thought it would be great to get everybodies input before I do so. Associated equipment is ARC VT100Mkii, Dali Helicon 800 and as source components Marantz SA14 and VPI Scout with Grado Reference cartridge. I would replace an ARC SP16 with either of the above mentioned pre amps.

Thx

Mike