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There is the MG The-O and MG Ex-S Gundam.
I would go with the PG Astray, I personally like it the best out of the three and is right in the middle between the two (price wise). But that’s just my opinion, I heard that the PG Strike Freedom is also pretty good. The PG Mk II is a bit older than the two but if you don’t mind that then it may be a good choice as well.

As well as the previously mentioned MG’s there is the MG Full Armour ZZ Gundam, though they’re more bulky than huge. However due to it’s bulk the FAZZ is a brick in terms of articulation.
The Sinanju is quite large and very similar in terms of style to the Sazabi, but it’s more tall than bulky like Sazabi or The-O.
The Sinanju Stein is just like the Sinanju but with more of a boxy/prototype feel to it.

I think that the PG Strike freedom is a bit overpriced for something that doesn’t have as nice of a design as other suits in PG form so I personally would skip it. (For some reason the bling doesn’t do it for me :/ )
That being said If you do like the design then go for it as it is apparently one of -if not the- most challenging and interesting builds of all PGs.

I really like the design of both the PG MK-II and PG Red Frame so I would choose which one on the basis of what I’m looking for. ie. anime feel-MK-II, real robot/mecha feel-RF, dynamic poses-RF, painting and displaying inner frame-MK-II.

Also, if you have already built the PG Strike or PG Strike Rouge, keep in mind that the PG Red Frame does share most of it’s inner frame with the PGStrike/PG Stirke Rouge.