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Over the years the armies that have grabbed me have been the ones that offer converting possibilities.
My first army was Orks, from the 2nd ed box. I was young, and enthusiastic, and the army was a complete stylistic mess - I got anything orky! They especially swelled in number once GorkaMorka came along and taught me about converting. I have so many patchwork buggies and trukks sitting in boxes at home!
And I had a 2nd ed chaos army, largely converted from space marines with more spikes. Happy days.
My first major theme army was in 3rd ed, mixing ork and space marine parts to make a Blood Axe themed army. The grots were goblins converted to look like Tallarn and Redeptionists. Happy days.
Then my armies got sillier. There was a mostly scratch-built Donarian Clawed Fiend army using Tyranid rules. And an army using Lost And The Damned rules and mostly snotling models, each squad imitating a different 40k army (snotau! necrotlings! snotnids! and so on...) And an Imperial Guard army with every platoon being goblin/guard kitbashes in the style of a different famous guard regiment...
And then I started hitting the Mechanicus. Using various codices to represent them, they've been lots of fun.
I'm not sure what direction to go in next. Quite possibly a very evil and tentacular Dark Mechanicus force, using Chaos and Daemon codices side-by-side. Daemon Engines a-go-go!
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In 2001 or so I walked into a hobbytown looking for r/c car stuff which i was into at the time and came across a box of firewarriors and was hooked right away. I'm now upwards of 4-5k points of Tau. Recently was looking for some marine allies to run along side them and came across a small army of awesomely painted Blood Ravens on ebay. Picked them up, expand them over the last couple months and sent the new models off to Blue Table to get matched with what I originally bought. Should be done soon. I play Tau because of their look and how similar they are to our military. Mech's, Fire warriors, Railguns, drones, and markerlights what's not to like..