Yep, the capacitors are a better choice for forcing the triacs to trigger. They do the same as the load resistors, but don't dissipate any power.
RG Common Anode 3mm, 10 for 99 cents from eBay: 361402985529 You can also have 100 for $4.99
If you're in a hurry, 20 for around $5 from a US seller, eBay: 162150695094
For DipTrace, search for component: APBA3010SURKCGKC-GX This is a common anode surface mount device. Then in the pattern editor, find LED(BI)-8R and combine that with the common anode component. That creates your common anode LED.
I have a personal library that I make parts in, it's getting to be quite sizeable.