From the three choices you give I'd agree the TF Elder would be the starting point...however the Elder takes some skill to build correctly and you have the tail-dragger aspect to consider for take-off and landings. As a long time builder and flyer, and seeing from your post you have one ARF under your belt (hopefully still flying it) I'd suggest something like the Carl Goldberg Eagle 2 kit or Tiger 2 kit, or a SIG 4-Star 40 or Mid-Star 40. Any of these offer great manuals and plans and when built nicely are very successful in the air. The SIG Mid-Star 40 has a mid-wing design that offers a bit more stability and is a ball to fly; the 4-Star 40 and Tiger 2 kits are low wing models which are more agile in the air and, therefore, require more attention when flying from the pilot. All are good r/c models. PLEASE: if you are just getting started, stay away from the P-51 (and similiar type models) until you have 3 or 4 models under your belt. They are fast and require ALOT of pilot input/attention/experience to fly. We want you to be successful and enjoy the hobby so ask all the questions you want as you build and follow a practical model design learning curve. You'll be rewarded with a very good building/flying learning curve that will allow you to fly that P-51 later with confidense.

Soft landings.

Joe