should this prepare my old engine for performance?

hey all, I'm thinking of replacing my timing belt, balance shaft belt, alternator belt, power steering belt, all tensioners and tensioner springs, and my water pump. Labor for all is $400. Parts, around $300-$350.
Is doing a job like this worth it? I'm trying to put an intake and exhaust on it and travel into the 4-5k RPM range more often. Also, how long will this extend my engine life? thanx

why are you replacing the tensioners and springs, also I dont see any seals listed

I heard some people say they put new belts on, then tensioners let go and engine blew. Also, i forgot to mention, the only seal I'm thinking of getting would be the camshaft seal. Other than that, my funds are very limited. What do you reccommend to replace?

I have 387,000 on my accord and I have never replaced the tensioners, the most critical seal is the balance shaft seal, but for less than 25.00 i would replace all of them including the oil pump o-ring

I worked at a honda dealer for over 8 years as the shop counter parts person and I think I probally sold may 5 tensioners in that time, If the belts are done right you shouldn't have any problems.

If you've got the tensioners then you might as well replace them but if you haven't bought them yet then don't and just use the money for seals

what seals should I replace and how much is labor gonna run me? Timing belt and balance shaft belt for install run me around $200-$250. How much more are seals gonna run? thanx

c'mon, someone respond ....please.

91233-PT0-003 BAL SHAFT SEAL 06923-P0A-306 BAL SHAFT SEAL RETAINER 15114-PT0-003 OIL DRIVE GEAR SEAL 91212-P0A-004 FRONT MAIN (CRANK) SEAL 91213-PT0-003 CAM SEAL 12341-P0A-000 VALVE COVER GASKET 12342-P2F-A01 SPARK PLUG TUBE SEALS X 4

thanx for the info, i priced everything at around $40. Installation will probably be a couple more zero's lol. 

If you go to majestichonda, i got all those seals, the timnig belt, balancer belt and water pump for 166 shipped.  Might want to check them out.

I have goodyear gatorbacks for the timing belt and balance shaft belts. just need water pump and gaskets.

are these all the things I need for a 90k x2 (180,000miles) tune up? just timing belts, balancer belts, water pump, and whats listed above? I got a mechanic that says he can do everything for $257. do I need anything else?

That should be complete.  Is the mechanic also going to do a valve adjustment? 

if he'll do the valve adjustment at the same time you may need a new valve cover gasket....

probably not, just installation. After all this, maybe i'll get an intake or exhaust system or something.