FLM CF (sorry dont know their models that well, but any will be better then your ries), Gitzo CF (GT what i use) with 4 sections, will be more then you will ever want for 4X5.
Get a nice head as you like, i use a three way, but would have like a geared compact head instead. Spend the dough, you only buy a tripod once, and it should be a good one that actually serves you well without trying to kill you or your back.
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