As Brett said, avoid Monroe or Gabriel brands.
- KYB's are cheap and reasonable quality. If you are on a tight budget, this is the one to get.
- Tokico is Toyota's OEM supplier. Similar to KYB in quality.
- Bilstein SPORT (be sure to get the right series) are excellent, though slightly more expensive. If money isn't an issue, get these. You won't be disappointed.
- KONI is adjustable, and the best that money can buy for a RAV, though not worth it, unless you are rally/road/autox racing.
Most RAVs will have non-sealed struts, so inserts will be cheaper. If they have been replaced once before, then many aftermarket strut assemblies are sealed.
If you are replacing the whole strut assembly, and you have non-sealed struts, ask the mechanic to give them to you. **I will GLADLY pay you good money for them**, or you can use them for your next suspension job, and save $$.
If your suspension clunks, ask your mechanic, when he's replacing the struts, to replace the end links, ball joints, and strut mounts too... Yes, it's expensive, but the clunk gets worse. I have been a victim, and am replacing all of the above (plus some) in the summer.