It is possible to do anything, however if that will result in satisfactory sound to you, only you can decide. That said, it's pretty much impossible to answer your questions, since we're not you.
You could try doing it in stages, good head unit, good speakers capable of low power (35W RMS or less) running only off the head unit, then plan to upgrade later if you need more power. Though then that would require new speakers again but you could sell the old ones to recoup cost.
If you need more low end, then a sub and sub amp would be required.
Sir G. Cal - 2k Sahara TJ
Living and loving on borrowed time. Life with Multiple Sclerosis.
My MS/Life blog, Audio and Electronic write-ups, project how-tos, pictures, stories, and more.
Originally Posted by SirGCal
If you can't take a nano-second to press shift/period/etc. and make proper sentences and paragraphs, I don't know if I can take a few minutes to respond to your topics... It doesn't have to be perfect by any means, but a little effort goes a long way.