Replace 8-Speaker Factory System Options

[mportobello]

I gathered all the details I could on the 8-speaker system here: Premium 8 Speaker System but it was all for naught. I an accidental short killed the amp and the tweeters. I've replaced it with an Alpine 4 channel amp, but it just doesn't sound the same. What can I do?

Budget: $250
With a budget of about $250 US, I'm looking for general recommendations on speakers and crossovers. What size? Where to mount? How would I best spend my money?

Existing, factory system:
- 1997 Celica GTS with 8-speaker factory system
- 1" tweeters in the A pillars (no longer functioning)
- 4" speakers mounted high in the front doors (4 ohm)
- 8" speakers mounted low in the front doors (2 ohm)
- 6" speakers in the rear (4 ohm) (can probably fit up to a 8" here)
- Head unit does not have an internal amp
- factory amp+crossover is dead
- replaced with Alpine MPR-F240 amp (4 channel, 40w per channel, 2-ohm stable, 80Hz high/low-pass filter)

The Problem
I've hooked the new Alpine amp up and the sound quality is only OK. I think the problems are:
- tweeters are dead
- no crossover
- the factory speakers are getting old

Preferences:
- I listen to rock, pop, funk, soundtrack classical
- Want a balanced system
- Don't like bright speakers, don't need deep bass, like midbass
- Don't want tweeter in the rear
- Willing to make custom mounting plates (e.g replace the 8" with a new 6")
- Not willing to make custom kick panels or fabricate trim pieces
- KISS

Any suggestions?
- Cheap,easy: 4" Inifinity coaxial up front, keep existing rear 6", front 8" but add passive band-pass and low-pass crossover
- Best,too expensive: 1"/4"/6" 3 way component set, replace 8" with 8" Kicker free air subs.
- Middle ground: get a high quality 2-way 1"/6" component set, drop all other speakers?
- Alternatives?

Thanks!
Brian