I'm still not a fan of Guinsoo's Rageblade. I'm not going to deny that it's good (otherwise everyone wouldn't be building it), but I'm not personally a fan of that build.
If I'm snowballing or even, I really like going for an assassination build mid-game. Something I've been planning to experiment with is the following:
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While it's squishier than I'm used to, I like the stat mixture (late-game at least).
- Trinity Force because it's Irelia.
- Sterak's Gage provides some addition AD and higher Spellblade damage.
- Phantom Dancer provides addition MS and attack speed, damage reduction when dueling, and brings you to 50% crit chance.
- Randuin's Omen helps you stick to targets once you've gotten onto them and helps you duel AA-based champions.
- Spirit Visage increases your healing, durability, and provides CDR.
Biggest issues are the lack of waveclear and the lack of mid-game defenses. The first could probably be solved by replacing Sterak's Gage with Titanic Hydra. The second could just be solved by adjusting the order the items are purchased in.