You're on the
East Coast - you at least need a
depth sounder
You can spend as much or as little as you want on electronic
gear and toys but you should make getting a good solid, sound boat your main objective because the
electronics are mostly extras you can either do without initially or add on later. They also become obsolete very quickly - if you want to find out about it the best way is to trawl the net, read the magazines and catalogs and talk to people, especially on
forums where there are so many opinions to choose from
Basic
instruments are
depth, speed/log and it's nice to have a
wind gauge but it's not essential. Hand held
GPS is fine for local sailing (I had a friend who went
liveaboard for 4 years around the UK and
Europe with just a hand held GPS) but you should first do it properly with
compass,
charts etc so you have good back-up skills if you have limited experience.
VHF radio is not mandatory on a
small boat but I am more comfortable with one than not especially with
family on board (plus you may need to help someone else out). Handhelds are good and reliable these days and not only waterproof but now float too. Or put a fixed one in with
antenna on the
mast for greater range.
You'll spend at least as much on
safety gear, lifejackets, harnesses, flares, possibly a
liferaft although this is a contentious point on some
forums...
Any cruiser you buy is likely to have at least this amount of kit on board anyway unless it was owned by a back-to-nature minimalist it's up to you how new sexy and modern you want it to be but make sure it works at least even if you want to replace it later.
I have a friend who has a very rare Moody 28 which is a lovely boat but like hens teeth on the secondhand market. We bought a Leisure23SL (£6-8k) as our first cruiser after
dinghy sailing and the Leisure27 (£14-17k) is good too we know many people with them. There's a lot of other good secondhand boats in the 23-28ft (£6k-28k) range on the
East Coast (Sadlers, Pegasus, BenJenBav etc) also worth looking at if you can't stretch to the Moody.
The Owners Associations are great sources of information on secondhand boats: Leisure, Westerley and Moody associations are all first rate and very helpful. You'll also find secondhand boats marketed on their websites (sometimes their owners sell through these channels only). If you have narrowed down to a particular model you really must have you can always place a wanted add there too.
So set your
budget and try not to go more than, say, 30% over it in your enthusiasm