96 Renault clio, stereo, speakers

i have posted a topic on this before, i have still not come to a decision, i need some further advice. so far i have:renault clio 1.2 (96 model) a sony explod s2200 MPOutput = 50W X4 (at 4 ohms)Sony xplod speakers 10cm 3 way. 120w peak power. 25w rated power(maybe someone can explain what this means exactly)i wasnt sure what speakers to get, i thought that to save time and work i could just instal thoughs 4inch speakers to replace the factory speakers, they are located under the fans (no room for larger ones). so after i had intalled them, i was dissapointed, i wasnt sure what to exspect really, i hadn't even tested the speakers out in the shop. Now i am thinking of 2 different things to do next to improve the sound.idea 1:get some 6x9 and instal them in the back parcel shelfidea 2:get another pair of speakers more powerful, (with lower frequency responce) and instal them in the fornt doors, so i will have 2 sets of speakers in the front. leaving the back empty until i can afford sub and amp.i am being told to go with idea 1, but then someone else will say "nah mate.. get better speakers up front"... please advis

i have decided to take the advice on upgrading the front my final question for this topic is: with the 4x50w output from my HU can i have 4 speakers in the front and 2 in the back? is this possible? i ask because it would be a shame to take out the factory replacement 4inch speakers. if i cant then i will simply uninstall the 4inch speakers and put some quality speakers into the door panels thanks to everyone for your help