Prothane bushing kit

Prothane bushes need lube and may become noisy after a while, unlike the stock rubber ones.
Twos'rus kits are ok to fit, but get the right swaybar bushes for your model.
 
The hardest to replace would be the lower control arm bushes.
Some people press the old ones out, others burn them out.
For more info, ask google.
 
If you you are ordering from twos'rus, and haven't already done them, also consider getting ball joints and front tie rod ends, both inner and outer depending on the condition of your old ones.
Also, how good are your swaybar endlinks?

"What are the strut bar bushings and the rear control arm to strut bar bushings? "
Caster rod bushes.
 
The pre '92 cars had different type mounts for the front caster rods, but Twos'rus kits have both types included anyway.
 
With the car raised tie rod ends (inner and outer) can be grasped and felt for slack, as well as ball joints.
But with my car I didn't want to mess around, so I replaced the lot anyway. There was a bit of slack in one so I thought the rest were probably on the way out too.
If your car has taken a hit that is a good reason to do the same.

Thanks for the advice so far guys. I'll jack up the car and give the tie rods and ball joints a good shake. 
 
I've only had the car for a year or 2 but as far as I'm aware I don't think any of the items Tree mentioned have been replaced by previous owners. I didn't know the cross member had to come out for the sway bar bushings! And I certainly didn't think this would be a 10 hour job! Damn...
 
How noticeable was the difference after swapping everything out? Did it just feel a bit newer and sharper or was it like driving a different/brand new car? I never really wanted to spend much money on this car. I'm basically just spending money on things that make it significantly faster and/or more enjoyable to drive.

I forgot to mention that you will have to remove the 3 rear engine mount bolts as well.

Haha if it took them 10 hours to do the rear sway bushings I would have WTF as well.
Adrian when I replaced the steering components and bushing it felt sharper and more direct - instantaneous control of steering and direction. It wasn't like a brand new different car since the MR2 already handles quite good but it was definately a difference. Ride may have become slightly harder too (from bushings). If I had to compare this to Doritos Salsa dips between Mild, Medium and Hot, I'd say it's about a medium. Plus I think my wheel alignment wasn't holding under hard cornering.
Altogether it costed me bit over 1k parts and labour for this. I know what you mean when trying to keep costs down so you do what you have to do. For my car I had to do this for it to be even worthy on the track lol

rear swaybar bushes would be the hardest part though... friggin fiddly. I bought some of those ratchetting spanners to help me get the bolts out as i couldn't get my socket set into the exhaust and swaybar bolts.