Btw, try bargainin bcoz 4050UB is for 9000 (Bought it 2 months bak for me and 3 days ago for a friend).
Abt da speakers iv seen a presentation with my pre (4050) with Orig kenwood 718 and 718ex and infinity 937ie
718 Rs 5800 (Good)
718ex Rs 5900 (Good)
Infinity 937ie Rs 6500 (Throw kenwood away!)
P.s: Ur pre is great for even further upgrades because 3 pairs of 4v-Preout is nice and will remain da same till 7150UB which is for 17500! Till then only looks will change!!
Hope its of help!