Need to replace HD + (possibly) battery

Question

Hi -- I've got a MBP 4,1 (Early 2008) -- and the hard drive is starting to make pretty loud noises.  It coincided (at least I *think* it did) with a repair that the Apple Store did on a the case or housing that includles the trackpad & surrounds the keypad.  But I figure that's just a coincidence. 
1.  At any rate, I've got a Fujitsu 200GB drive that came with the machine.  And though I've been pretty good about backing up my data, I think it may be time to replace the drive (I assume the symptoms are awful noises -- but maybe not?).  Specs on the current drive are at the end of this message.
Will this drive fit:
Western Digital 750GB
http://www.newegg.com/Product/Product.aspx?Item=N82E16822136546
                    WD7500BPVT 750GB 5400 RPM 8MB Cache 2.5" SATA 3.0Gb/s Internal Notebook Hard Drive -Bare Drive
Also -- I don't understand the difference between 5400 RPM and 7200 RPM.  I understand what RPM literally means -- but will either of these speeds work with my machine (a google search suggests so but I wasn't sure) or is my choice of harddrives confined to one particular speed?  I don't see any particular RPM spec for my current HD in the System Profiler.
2.  In addition, the system profiler suggests that the battery be "replace[d] soon".
Battery Information:
  Model Information:
  Manufacturer:    SMP
  Device name:    ASMB012
  Pack Lot Code:    0002
  PCB Lot Code:    0000
  Firmware Version:    0110
  Hardware Revision:    0500
  Cell Revision:    0200
  Charge Information:
  Charge remaining (mAh):    2626
  Fully charged:    No
  Charging:    Yes
  Full charge capacity (mAh):    2990
  Health Information:
  Cycle count:    729
  Condition:    Replace Soon
  Battery Installed:    Yes
  Amperage (mA):    513
  Voltage (mV):    12574
Can I purchase a new battery from Apple -- or would y'all make another recommendation of something that's as good?  Thanks for your time!
Current Specs of HD:
Intel ICH8-M AHCI:
  Vendor:    Intel
  Product:    ICH8-M AHCI
  Link Speed:    1.5 Gigabit
  Negotiated Link Speed:    1.5 Gigabit
  Description:    AHCI Version 1.10 Supported
FUJITSU MHY2200BH:
  Capacity:    200.05 GB (200,049,647,616 bytes)
  Model:    FUJITSU MHY2200BH                      
  Revision:    0081000D
  Serial Number:            K43BT82286L3
  Native Command Queuing:    Yes
  Queue Depth:    32
  Removable Media:    No
  Detachable Drive:    No
  BSD Name:    disk0
  Medium Type:    Rotational
  Partition Map Type:    GPT (GUID Partition Table)
  S.M.A.R.T. status:    Verified
  Volumes:
  Capacity:    209.7 MB (209,715,200 bytes)
  Writable:    Yes
  BSD Name:    disk0s1
Macintosh HD:
  Capacity:    199.57 GB (199,571,456,000 bytes)
  Available:    30.71 GB (30,706,036,736 bytes)
  Writable:    Yes
  File System:    Journaled HFS+
  BSD Name:    disk0s2
  Mount Point:    /

Answer 1

Bump.
It's looking like one of these 2.5" SATA drives from OWC will fit:
http://eshop.macsales.com/shop/hard-drives/2.5-Notebook/
But I'm a bit confused over a particular speed is necessary or if one can use any RPM speed?
Wasn't sure if HD RPM is linked to memory (RAM) speed?
If someone can direct me toward what's possible for the OWC drivers in my Late 2008 Macbook Pro model 4,1,
I'd sure appreciate it :_
This one looks good:
http://eshop.macsales.com/item/Hitachi/0A72335/
Hitachi
500GB Travelstar™ 7K500 Hard Disk Drive
2.5-Inch | SATA 3.0Gb/s | 7200RPM | 16MB Cache
High-performance storage for notebook PCs
Enterprise-class features and functions
Travelstar™ 7K500 is the industry's only fifth-generation 7200RPM 2.5-inch hard drive with capacities ranging from 120GB to 500GB, matching Hitachi 5400 RPM capacities. The 250GB per platter one- and two-disk models deliver up to 56% higher capacity and 16% better application performance than its predecessor. Hitachi provides best-of-breed operating shock and outstanding power management in Travelstar 7K500 for sturdy unplugged notebook performance. With its halogen-free production and low power consumption, the 7K500 carries the Hitachi EcoTrac classification. Designed to support the high-performance needs of multi-tasking commercial users and consumers on-the-go, Travelstar 7K500 offers speed without sacrificing battery life, capacity or audio quality.
Highlights 
Proven fifth-generation technology
Up to 500GB¹ of capacity
Low power consumption
Highest operating shock
Halogen-free for eco-friendly footprint
Serial ATA 3Gb/s
Free Installation Videos
Warranty Safe Upgrade.
3 Year Warranty
Applications
Notebook PCs
Gaming PCs
Compact desktop systems
Small-form-factor video devices