I'm building a duskblade in a campaign and we're planning on going all the way to lvl 20 and beyond. As such, our DM has allowed for level adjusted races and templates and buyoff.

Currently, I'm a Spellwarped Human and am a lvl 7 duskblade. (ECL 10)
I'm set up to take the first (and quite frankly only needed) level of the Sandshaper PrC on my next level up. My question to all of you is, where do I go from here? I know Duskblade is a really good class by itself, but I don't want to take it all the way to 20. (at least not before epic levels.) And as for feat selection, beyond getting Arcane Strike at HD 9, I'm stumped for good feat selections.

Here's a brief rundown of my guy so you know what you're looking at:

Yangash, The Bloody
NE Spellwarped (+3 lvl adj) Human - Duskblade 7 (ECL 10)

Stats - 36 point buy:
STR: 20 (16 bought + 4 spellwarped)
DEX: 14 (12 bought + 2 spellwarped)
CON: 18 (14 bought + 4 spellwarped)
INT: 20 (16 bought + 4 spellwarped)
WIS: 15 (14 bought + 1 at 4th lvl)
CHA: 8 (none bought)

My feat selection with two flaws is as follows:
Flaw: Shakey (-2 to ranged attacks - I'm an up close and personal kind of guy.)
Flaw: Inattentive (-4 to Listen and Spot checks - who needs those when you have the druid to do that?)
Bonus: Exotic Weapon Proficiency (Spiked Chain)
Bonus: Weapon Focus (Spiked Chain)
1st: Power Attack
Human: Arcane Disciple (Suffering Domain)
3rd: Knowledge Devotion (Local)
6th: Touchstone
9th: Arcane Strike
12th: ???
15th: ???
18th: ???
21st: ???
and beyond