I've also got an Alpine 4x60W (V-drive amp) in my head-unit, just ordered a pair of Pioneer 17C5's (for the front) and a pair of 13C5's (to replace the 13cm component set in the back walls). Power handling is 50W RMS on the front and 40W RMS on the back, but they have a good range (28Hz-32kHz) and I'd prefer not to have to get a sub as boot is TIGHT! Aprox ?200 for front and rear...
Alpine SPX's looked V nice (60W RMS, 240W PMPO, good full range, sweet build, etc), but was gonna be ?1000 for the four speakers!! SPR's were approx ?250, less range / performance on paper and I was advised that they're no better than the Pioneers (above).
In my last car, the speakers were 4 x Pioneer 1375's on a Sony CDXMP30 (4 x 52W), sounded pretty decent... even had good base without the sub, just a bit fuller with the sub...