In general if you want Sense you are going to be slower than CM7, CM7 RC1 the gps works fine. If you want to build a ROM go for it, its nice to have new developers although I warn you its not an easy thing to do. You just need to weigh the ups and downs of each ROM. Almost no matter what ROM you are on you are going to have pros and cons. If you look in my signature it has the ROM I use for Sense and my AOSP ROM. For sense I use King's ROM it is fast and works well, it is faster than rls5, also if you are looking for speed MikFroyo is another good Sense ROM. If you want pure speed and pure google try out CM7 RC1, it is probably the fastest ROM you will try and with RC1 almost everything works smoothly the only things not working right now is 4g and hdmi.
