What player are you using the PRO700MK2 with? For me, my primary DAPs are my Cowon Z2 and iPod Touch. With both, I usually set the EQ for bass boost. This probably adds about ~5db of bass quantity which greatly helps in bringing the PRO700MK2 to life.
If you feel that the E11 is a tad too big for you, try the ZO2.3. It's really small, but it manages to boost the bass to huge levels.
I use an ipod touch and an E11 w/ the L9 LOD cable, the size isn't a big deal, but my budget is, I don't want to spend more than $100 on an amp. Is the ZO2.3 better than the E11? Thanks