I gotta say if your going for the long term I would go w/ the 2 6101's w/ controller as they can be turned down if needed until you need the xtra flow (wish the made lights like that.......hmmmm) anyway, I am not being biased because I sell them, I have used many different powerheads and pumps over the years and seen others I haven't used in use in others tanks and still there are some I have not used or seen yet personally. I will only recommend something I have personally used and I can honestly say they are the best pumps I have used to date. Not only do the function well, but also if a problem does arise Tunze is one of the best companies I have ever worked with to handle the problem promptly and make it right. This is my OPINION and only that, I feel like my tanks speak for themselves on my experience and I may find another pump tommorow that changes my mind. I am not trying to debate on this, simply give my opinion on what works for me, just as everyone else is. Ultimately what ever you choose, I hope it works well for you, then you can post your opinion too the next time this greatly debated question arises.