This thread is a little old but I wanted to add what I got in case anyone sees this later. I went with two 5-gallon buckets from usplastic.com...one green and one red. Then I got two inserts (red and black) from buygritguard.com. With the two color buckets I can easily tell the difference between wash and rinse, and if I want to buy any more buckets later, I can grab some white ones locally. The drawback is it would be hard to see dirt in the colored buckets but since I got the grit guard I'm not too concerned about that. Also I had wanted 3 1/2 gallon but nobody seems to make colored ones that I can find, and well it will be better with 5 anyway so the suds won't overflow as easily. It would be cool to have casters but they are too expensive for me ($20 minimum)...likewise the Griot's looked interesting but way too costly for me (I'd rather put the money into other things than a bucket). All total is like $55...($5.50 a bucket, $15 an insert, plus shipping, etc.)