I think that what gbildson said should NOT be done, that will lead to the segmentation of gnutella, and can break the network. None peer should be treated differently. Also Morpheus is not that bad, most of it's problems is that it wont count well the number of hosts, by reducing the amount of pongs. But it is based on Gnucleus, and Gnucleus is an excelent client that takes very little bandwith, and does a great job as ultrapeer. I think the best ultrapeers are Limewire and Gnucleus (thus also includes Morpheus).
Also take it positively, Morpheus brings Gnutella a greater userbase, so you will be able to find more files.
By the way I don't use any of those. I use Shareaza, which is great.