Hi RickyBobby,
ECS/DCJ (same thing) is really the first and most critical upgrade to make. As Beale suggested, I would agree that 52mm is best because they are less likely to break the spool cups if you use composite. I would suggest getting the ES version, also as Beale mentioned. The ES version is way more durable, however will require purchase of the new caster blocks because they are slightly larger and will rub the c-hub otherwise. I would advise against aftermarket DCJs because they will require a 3mm wide bearing on the inside of the steering block, and even though the narrower bearing is on the inside of the block, it will still blow out & become crunchy very fast.
Here are part numbers for the ideal setup for option 2:
52mm ECS assembly (Part No. 305332)
http://www.teamxray.com/teamxray/produc ... ategoria=0(this link provides some build tips which are great for ensuring smooth and long-lasting operation)
Composite C-Hub Right - 4* - Medium (Part No. 302363)
http://www.teamxray.com/teamxray/produc ... -%20MediumComposite C-Hub Left - 4* - Medium (Part No. 302364)
http://www.teamxray.com/teamxray/produc ... -%20Medium