For a high-end Probot you have a few options:
1. 1:5 scale Attakus statue. Pros: very nice size, pretty impressive on display. Cons: uber fragile (many arrived with broken parts), less accurate than SSC version, non-movable parts (it's a statue);
2. Studio scale model. You can assemble it yourself or pay (big bucks) to be assembled and finished by a professional. Pros: the most accurate Probe Droid, movable parts, a bit larger than both Attakus and SSC. Cons: huge price, hard to find (this could be a pro when re-selling), if assembled by a pro, even more expensive;
3. 1:6 scale SSC figure. Pros: very cool on display, snow base, lights and sound included, movable arms, more accurate than Attakus, a bit less accurate than studio scale (though made with the help of the talented RPF member MoffEaton who also worked on EFX TIE Fighter - check the COA). Cons: the smaller of the bunch, lightweight (this is not an issue for me, but since more than one person addressed it, I decided to put it at cons)
All three versions are fragile, these are not made of titanium with armored bodies, they are not battle tanks, they are high-end collectibles. The Attakus is made of polystone/resin, studio scale is made of a combo of resin, metal and plastic, and SSC is made of ABS plastic and some metal.