I can't find information about how much ETH devs wanna collect during ICO and why ICO will last 3 months? During 3 months price of ETH can change from 100 to 500$, it's strange, but main project looks good, looks like devs don'r wanna take a lot of hype want to work quietly.
The price of ethereum is not a problem as if the price of ethereum will increase then this coin will also go precious which is making this coin more better for us as within the time of ICO the price of it will increase. The early investors in this way will earn a profit faster then lateral investors.
I don't think it is better, nor the same. 1 ETH will be the same and will worth equivalent to 1 ETH at the end of ICO.
What you should care more is the bonus that the DIMCOIN offers for early investors.
Personally I think that the best way to invest in DIMCOIN is by purchasing in USDT which is the most equivalent to USD and has pretty much the same value.