Hands down buy a TM pistol, it will bring maximum joy and minimum ball ache.
Any of the ones youve listed are great, BUT i wouldnt go for the Hi-Capa personally - hang on Capa crowd! - yes the Hi-Capas are good historically and very upgradeable, but THE best TMs are the newer generation models with the 15mm BBU, what this means for the user is exceptional cold weather performance and a really solid 'kick' / recoil.
You can happily upgrade your TM with a quality aluminium slide in the future if you want to with no loss in performance.