When i returned my ie800s for replacement, i actually spent time using my grado iems - gr10 and igi. I found both quite enjoyable in their own way. The igis are a great buy for the price. Very musical particularly if you like a midcentric sound. The gr10s are also very very good. I really like their treble presentation - brilliant and very elegant - but i suspect some people will find it too bright. The biggest problem for me is that they don't handle volume very well. If you push them hard, they tend to distort. I have noticed that this is sometimes the case with BA type drivers. They have a specific volume window where their sound is optimal. In contrast, the ie800s can be played very loud without any noticeable distortion. In terms of volume, it has a huge sweet spot.
One thing that should be noted is that, even though the ie800s have a reputation for its bass, the treble presentation is also excellent and often under-appreciated. There are quite a few headphones out there that have strong bass, but very few can also handle the upper register in such an impressive fashion.