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which Imperial guard model would best represent Thousand Sons spire guard?

Struggling to find a piece of artwork to reference, have you got an example?

The only info I have is that they are red and gold, as to match 30k colors of the Thousand Sons.

I'd go third party for this as there really isn't a good match for the egyptian theme of the T-suns in the current model line.

The best would be a long trench coat, so either kreig or ad mech, with shakoes helms, literally the best picture is right here.

http://bloodofkittens.com/wargaminghub/2014/02/08/heresy-era-thousand-sons-prospero-spireguard-test-minis/

I too am looking to do this but it's expensive.

Try Anvil Industries' Regiments line, it's the go-to place for custom Guard designs and you should at least be able to approximate the look with what's on offer.
http://anvilindustry.co.uk/Regiments/

Can confirm that anvil industries is good, same thing with Victoria minitures it's basically build a guard workshop